TransTel Communications TD-824i Assembly instructions

Notification
Notification is hereby given that TransTel Communications Inc. reserves the right to modify, change, update or
revise this document from time to time as required without the prior obligation to notify any person, company or
organization. Further, TransTel makes no warranty or representation, either expressed or implied, with respect to
merchantability, or fitness of its products for a particular purpose.
© 2001-2006 TransTel Communications Incorporated
This document or any parts thereof are not to be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, or information storage and retrieval systems for any purpose
whatsoever without the express written permission of TransTel Communications Inc.

Page 2 Version 1.3b October 2005
Includes all versions through G1-a20x
IMPORTANT SAFETY INSTRUCTIONS
Installation Safety Precautions:
1. Never install telephone wiring during a lightning storm.
2. Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
3. Never touch un-insulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
4. Use caution when installing or modifying telephone lines.
The TransTel TD-824-I utilizes a 3-prong grounding power supply cord. This cord is not to be
attached to any building surfaces. When using your telephone equipment, basic safety precautions should always be followed to
reduce the risk of fire, electric shock and injury to persons, including the following:
1. Read and understand all instructions.
2. Follow all warnings and instruction marked on the
product.
3. Unplug this product from the wall outlet before
cleaning. Do not use liquid cleaners or aerosol
cleaners. Use a damp cloth for cleaning.
4. Do not use this product near water, for example, near
a bath tub, wash bowl, kitchen sink, or laundry tub,
in a wet basement, or near a swimming pool.
5. Do not place this product on an unstable cart, stand,
or table. The product may fall, causing serious
damage to the product.
6. Slots and openings in the cabinet and the back or
bottom are provided for ventilation, to protect it
from overheating. These openings must not be
blocked or covered. The openings should never
be blocked by placing the product on a bed, sofa,
rug, or other similar surface. This product should
never be placed near or over a radiator or heat
register. This product should not be placed in a
built in installation unless proper ventilation is
provided.
7. This product should be operated only from the type
of power source indicated on the marking label. If
you are not sure of the type of power supply to
your home or office, consult your dealer or local
Power Company.
8. This product is equipped with a three-wire grounding
type plug. A plug will only fit into a grounding type
power outlet. This is a safetyfeature. If you are
unable to insert the plug into the outlet, contact
your electrician to replace your obsolete outlet. Do
not defeat the safety purpose of the grounding type
plug.
9. Do not allow anything to rest on the power cord or place it
where it will be abused by persons walking on it.
10. Do not overload wall outlets and extension cords as this can
result in the risk of fire or electric shock.
11. Never push objects of anykind into this product through
cabinet slots as they may touch dangerous voltage points or
short out parts that could result in a risk of fire or electric
shock. Never spill liquid of any kind on the product.
12. To reduce the risk of electric shock, do not disassemble this
product, but take it to qualified service personnel when
service or repair work is required. Opening or removing
covers may expose you to dangerous voltages or other
risks. Incorrect re-assemblycan cause electric shock when
the appliance is subsequently used.
13. Unplug this product from the wall outlet and refer servicing to
qualified service personnel under the following conditions:
A. When the power supply cord or plug is damaged or frayed.
B. If liquid has been spilled into the product.
C. If the product has been exposed to rain or water.
D. If the product does not operate normallyby following the
operating instructions. Adjust only those control, that are
covered by the operating instructions because improper
adjustment of other controls mayresult in damage and will
often require extensive work by a qualified technician to
restore the product to normal operation.
E. If the product has been dropped or the cabinet has been
damaged.
F. If the product exhibits a distinct change in performance.
14. Avoid using a telephone (other than a cordless type) during
an electrical storm. There may be a remote risk of electric
shock from lightning.,
15. Do not use the telephone to report a gas leak in the vicinity of
the leak.
SAVE THESE INSTRUCTIONS

Page 4 Version 1.3b October 2005
Includes all versions through G1-a20x
TransTel Model TD-824-I
Digital Telephone System
General Description - Installation - Programming Forms Manual
Table of Contents
Notification..........................................................................................................................................................................1
General Description - Introduction ..................................................................................................................................10
FCC Rules and Regulation..............................................................................................................................................10
FCC Registration Number ...........................................................................................................................................10
Ringer Equivalence Number .......................................................................................................................................10
Notification of the Telephone Company......................................................................................................................10
Incidence of Harm to the Telephone Lines.................................................................................................................10
Compatibilityof the Telephone Network and Terminal Equipment...........................................................................11
Radio Frequency Interference.....................................................................................................................................11
Description........................................................................................................................................................................12
Economy and Efficiency...............................................................................................................................................12
Easy Installation ...........................................................................................................................................................12
Easy Maintenance........................................................................................................................................................13
Flexibility of System Applications.................................................................................................................................13
Varied Extension Alternatives......................................................................................................................................13
Digital Twin Port...........................................................................................................................................................13
Liquid Crystal Display...................................................................................................................................................13
System Specifications..................................................................................................................................................15
System Capacities / Maximum.................................................................................................................................15
Electrical Specifications...............................................................................................................................................15
Mechanical Specifications (Key Service Unit).............................................................................................................16
Mechanical Specifications (Battery Back Up Housing)...............................................................................................16
Environmental Specifications.......................................................................................................................................16
Features ...........................................................................................................................................................................17
System Features..........................................................................................................................................................17
Station Features...........................................................................................................................................................18
Optional Features.........................................................................................................................................................18
Parts & Peripherals..........................................................................................................................................................19
System Modules...........................................................................................................................................................19
Type of Phones............................................................................................................................................................19
Peripheral Devices.......................................................................................................................................................19
Optional Interface Cards..............................................................................................................................................20
Associated Software ....................................................................................................................................................20
System Installation - Introduction ....................................................................................................................................21
Site Requirements ...........................................................................................................................................................22
Location........................................................................................................................................................................22
Choosing The Right Environment............................................................................................................................22
Installation Checklist....................................................................................................................................................22
Equipment Requirements................................................................................................................................................22
Installation ........................................................................................................................................................................23

TransTel Model TD-824-I Digital Telephone System – Table Of Contents
Page 5
Installing expansion and optional cards......................................................................................................................23
TD-CFC - Conference Card....................................................................................................................................24
TD-MSC - Multi Service Card..................................................................................................................................24
G1-VSC - Voice Service Card.................................................................................................................................24
TD-TKU - 4 Port CO Line Card...............................................................................................................................25
TD-STC - Digital Station Expansion Card..............................................................................................................26
TD-SLC - Single Line Station Adapter Card...........................................................................................................27
TD-RGU - Ring Generator Unit...............................................................................................................................27
Voltage Selection Check.........................................................................................................................................28
Backboard................................................................................................................................................................28
Key Service Unit....................................................................................................................................................... 28
Power Supply...............................................................................................................................................................28
Preparing The External Battery Backup.....................................................................................................................29
Charging the Battery....................................................................................................................................................29
Installing or Replacing Batteries.................................................................................................................................29
System Ground............................................................................................................................................................30
KSU Connecting (Main) Panel Layout........................................................................................................................30
Connecting Stations ....................................................................................................................................................30
Digital Key Telephone – DK-1D, DK-1S, DK-1B, DK2, DK3-D, DK3-B....................................................................30
Access Control Phone (ACP) and Digital Doorphone Unit (DDU)............................................................................32
Single Line Telephone ................................................................................................................................................33
Analog Door Phone Connection.................................................................................................................................34
CO/PABX Connections ...............................................................................................................................................35
Optional Cabling..............................................................................................................................................................35
Door Switch (Relay) Connection.................................................................................................................................35
Sensor Connection......................................................................................................................................................35
Paging Connection......................................................................................................................................................35
Music on Hold Connection..........................................................................................................................................36
RS232 Port Connection ..............................................................................................................................................36
Power On and Operational Test.....................................................................................................................................37
Operational Tests........................................................................................................................................................37
Series Model TD-824i - Programming Forms Manual ..................................................................................................38
Programming Information...........................................................................................................................................38
New Systems...........................................................................................................................................................38
Lost Programming Key............................................................................................................................................38
Alphanumeric Entry:................................................................................................................................................40
Form 01 - Day Ringing and Ringing Line Preference Assignment ...........................................................................41
Form 02 - Night Ringing and Ringing Line Preference Assignment.........................................................................42
Form 03 - Door Phone Ringing Assignment Form ....................................................................................................43
Form 04 - Console Assignment Form........................................................................................................................44
Form 05-01 - System Parameters Form - Timers-1
G1-a20m G1-a20t
.............................................................................45
Form 05-02 - System Parameters Form - Timers-2..................................................................................................47
Form 05-03 - System Parameters Form - Codes-1...................................................................................................49
Form 05-04 - System Parameters Form - Codes-2
G1-a20u
........................................................................................51
Form 05-05 - System Parameters Form - Codes-3...................................................................................................53
Form 05-06 - System Parameters Form - Timer/Codes...........................................................................................55
Form 05-07 - System Parameters Form - Timer/Codes
G1-a20u
.................................................................................57
Form 05-08 - System Parameters Form - Timer/Codes...........................................................................................59
Form 05-09 - System Parameters Form - Misc.
G1-a10ax
.............................................................................................61
Form 05-10 - Voice Mail Leading Digits
G1-A10n G1-A20o
................................................................................................63
Enhanced Protocol......................................................................................................................................................63
Answering Machine Operation....................................................................................................................................64
Record Function..........................................................................................................................................................64
Direct To Voice Mail ....................................................................................................................................................64
Message Waiting Digits...............................................................................................................................................64
More About Voice Mail ................................................................................................................................................64
Form 05-11 - System Parameters Form – Supplemental
G1-a10ao
..............................................................................65
Form 05-12 - System Parameters Form - Miscellaneous
G1-a10h G1-a20u
....................................................................67
Form 05-13 - System Parameters Form - Miscellaneous
G1-a10aw
.............................................................................69

TransTel Model TD-824-I Digital Telephone System - General Description - Installation - Programming Forms Manual
Page 6 Version 1.3b October 2005
Includes all versions through G1-a20x
Form 05-14 - System Parameters Form – Miscellaneous.........................................................................................70
Form 06-01 - Relay Assignment Form:
G1-10a6
.............................................................................................................71
Form 06-st – ACP/Doorphone Relay Assignment Form:
G1-10a6
.................................................................................71
DK-2 Key Layout.......................................................................................................................................................73
DK-3 Key Layout.......................................................................................................................................................74
Form 07 - Flexible Key Group Assignment:................................................................................................................75
Form 07 - Key Assignment Parameters:.....................................................................................................................77
Form 08-01-IP - DSS Key Group Assignment:..........................................................................................................78
Form 09 - System Speed Dial Assignment:................................................................................................................79
Form 10 - Single Digit Dialing Assignment : ...............................................................................................................81
Form 11 - Date and Time Settings:.............................................................................................................................82
Form 12 - System Alarm Schedule:...........................................................................................................................83
Form 13 - System Passwords: ....................................................................................................................................84
Form 14 - Station Message Detail Recording:............................................................................................................85
Form 17 - Forced Account Code Assignment:...........................................................................................................89
Form 18 - Toll Plan Assignment:
G1-a10aw
....................................................................................................................90
Form 19 - Voice Service Unit Channel Assignment:..................................................................................................92
Form 20 - Day/Lunch/Night Service Switching Schedule:..........................................................................................94
Form 25 - Reset Data to System Default:...................................................................................................................95
Form 29 - CO Line Specifications #1:........................................................................................................................96
Form 35 - CO Line Specifications: ..............................................................................................................................98
Form 36 - CO Line Groups (Dial 9 Groups):............................................................................................................100
Form 37 - Busy Out CO Trunk: .................................................................................................................................100
Form 38 - Alternate CO Line Groups (Dial 87 Groups):..........................................................................................101
Form 39-00 - Sensor Assignment Form – KSU Sensor only:..................................................................................102
Form 39-st Sensor Assignment Form – ACP and Doorphone Units:
G1-a10aq
...........................................................103
Form 40 - Station Class of Service (Part 1):............................................................................................................104
Form 41 - Station Specifications................................................................................................................................106
Form 42 - Personal Speed Dial Table Assignment:.................................................................................................108
Form 43 - Port Assignments:.....................................................................................................................................110
Form 44 - Station Class of Service (Part 2):
G1-a10as
................................................................................................112
Form 45 - Station Class of Service (Part 3):............................................................................................................114
Form 46 - Station Class of Service (Part 4):
G1-a10av
................................................................................................116
Form 47 - Hot Line Table:..........................................................................................................................................119
Form 50 - Station Class of Service (Part 5):............................................................................................................120
Prog. Form .................................................................................................................................................................122
Form 51 - Exception (Allow) Tables:.........................................................................................................................123
Form 61 - Deny Tables:.............................................................................................................................................123
Form 52 - Exception (Allow) Tables:.........................................................................................................................124
Form 62 - Deny Tables:.............................................................................................................................................124
Form 53 - Exception (Allow) Tables:.........................................................................................................................125
Form 63 - Deny Tables:.............................................................................................................................................125
Form 54 - Exception (Allow) Tables:.........................................................................................................................126
Form 64 - Deny Tables:.............................................................................................................................................126
Form 55 - Exception (Allow) Tables:.........................................................................................................................127
Form 65 - Deny Tables:.............................................................................................................................................127
Form 56 - Exception (Allow) Tables:.........................................................................................................................128
Form 66 - Deny Tables:.............................................................................................................................................128
Form 57 - Exception (Allow) Tables:.........................................................................................................................129
Form 58 - Exception (Allow) Tables:.........................................................................................................................129
Form 59 - Exception (Allow) Tables:.........................................................................................................................130
Toll Control Examples ...............................................................................................................................................130
Form 67 - Hunt Group Pilot Assignment:..................................................................................................................131
Form 68 - Day Hunt group assignments:..................................................................................................................132
Form 69 - Night Hunt group assignments:................................................................................................................133
Form 70-Cd - ISDN Interface Specifications Program:............................................................................................134
Form 71-tk - ISDN Line Number Assignment Program:..........................................................................................135
Form 72 - ISDN Called Party Extension Number Assignment:................................................................................135
Form 73-st - ISDN Extension Sub Address Assignment:.........................................................................................135

TransTel Model TD-824-I Digital Telephone System – Table Of Contents
Page 7
Form 74 - Least Cost Routing - Digit String Analysis Table: ...................................................................................136
Form 74 - Least Cost Routing - Digit String Analysis Table: ...................................................................................137
Form 76 - Least Cost Routing - Routing Table Normal Operation:.......................................................................138
Form 76 - Least Cost Routing - Routing Table Special Day Rate:........................................................................139
Form 76 - Least Cost Routing - Routing Table Second Special Rate Day Operation:.........................................140
Form 77-num - Least Cost Routing - Modify Digits Table: ......................................................................................141
Form 77-num – Least Cost Routing – Modify Digits Table (continued):.................................................................142
Form 78 - Station Class of Service (Part 6):
G1-a20u
.................................................................................................144
Caller ID and Redial Patterns.......................................................................................................................................147
U.S. Caller ID Overview ................................................................................................................................................147
Various North American Dialing sequences.............................................................................................................147
1. Local Call (7 digit).............................................................................................................................................147
2. Local Toll (7 digit).............................................................................................................................................148
3. Local Call (10 digit)...........................................................................................................................................148
4. Local Toll (1 + 7 digit).......................................................................................................................................148
5. Local Toll (1 + 10 digit).....................................................................................................................................149
6. Outside of Area Toll (1 + 10 digit)....................................................................................................................149
Form 83 - Caller ID Block Assignment:....................................................................................................................150
Form 84-01 – Home Area Code:..............................................................................................................................151
Form 85-nn – Overlay Area Code:...........................................................................................................................151
Form 86-nnn – Office Code Pattern:........................................................................................................................151
Form 86-nnn – Office Code Pattern 300—399:......................................................................................................152
Form 86-nnn – Office Code Pattern 400—499:......................................................................................................153
Form 86-nnn – Office Code Pattern 500—599:......................................................................................................154
Form 86-nnn – Office Code Pattern 600—699:......................................................................................................155
Form 86-nnn – Office Code Pattern 700—799:......................................................................................................156
Form 86-nnn – Office Code Pattern 800—899:......................................................................................................157
Form 86-nnn – Office Code Pattern 900—999:......................................................................................................158
Programming Cross Reference....................................................................................................................................159
By Application:...........................................................................................................................................................159
Incoming Calls:......................................................................................................................................................159
Outgoing Calls:......................................................................................................................................................159
Intercom Calls:.......................................................................................................................................................160
Busy/During Conversation:....................................................................................................................................161
DISA:......................................................................................................................................................................161
Night Service:.........................................................................................................................................................162
Group Assignments:..............................................................................................................................................162
Call Control:...........................................................................................................................................................162
System Clock:........................................................................................................................................................163
Station Numbering:................................................................................................................................................163
Single Line Telephone:..........................................................................................................................................163
Miscellaneous:.......................................................................................................................................................163
Optional Services:..................................................................................................................................................164
Voice Mail Integration: ...........................................................................................................................................164
Caller ID:................................................................................................................................................................164
SMDR:....................................................................................................................................................................164
Voice Mail:..............................................................................................................................................................165
Hunt Groups:..........................................................................................................................................................165
Trunk Assignment:.................................................................................................................................................165
Toll Control: ...........................................................................................................................................................165
Least Cost Routing:...............................................................................................................................................165
By Program Type in Alphabetical Order:..................................................................................................................166
System Parameters:..............................................................................................................................................166
TransTel Key Telephone Operation Manual................................................................................................................169
Introduction................................................................................................................................................................169
1A2 Emulation / Privacy Release..........................................................................................................................169
Account Codes – Client.........................................................................................................................................169
Advisory Messages................................................................................................................................................169
Alternate Trunk Group Access (Dial 87)...............................................................................................................169

TransTel Model TD-824-I Digital Telephone System - General Description - Installation - Programming Forms Manual
Page 8 Version 1.3b October 2005
Includes all versions through G1-a20x
Answering Calls......................................................................................................................................................170
Answering a Doorphone.........................................................................................................................................171
Answer Paging (Meet Me Page)............................................................................................................................171
Automatic Callback ................................................................................................................................................171
Automatic Last Number Redial..............................................................................................................................172
Automatic Line Access...........................................................................................................................................172
Automatic Redial ....................................................................................................................................................172
Automatic Saved Number Redial ..........................................................................................................................172
Background Music..................................................................................................................................................173
Barge-In (Override).................................................................................................................................................173
Caller ID Features..................................................................................................................................................173
Call Forwarding......................................................................................................................................................174
Call Forward All stations (Operator Function)
G1-a10e
............................................................................................175
Clear All Call Forwarding (Operator Function)
G1-a10e
...........................................................................................175
Call Hold.................................................................................................................................................................175
Calling the Doorphone...........................................................................................................................................175
Call Pickup..............................................................................................................................................................175
Call Swap................................................................................................................................................................176
Call Transfer...........................................................................................................................................................176
Call Waiting (Camp On).........................................................................................................................................177
Conference.............................................................................................................................................................177
Conversation monitor.............................................................................................................................................178
Date and Time Setting (Operator Function)..........................................................................................................178
Day / Night Service Switching Setup (Operator function).....................................................................................178
Dialing Operator .....................................................................................................................................................179
Direct Trunk Access...............................................................................................................................................179
Do Not Disturb........................................................................................................................................................179
Environment Monitor ..............................................................................................................................................179
Exclusive Hold ........................................................................................................................................................179
Feature Menu .........................................................................................................................................................180
Flash (To an outside telephone line).....................................................................................................................180
Forced Account Codes ..........................................................................................................................................180
Group Listen...........................................................................................................................................................181
Handsfree Operation..............................................................................................................................................181
Immediate CO Line Access ...................................................................................................................................182
Intercom dialing......................................................................................................................................................182
Last Number Redial ...............................................................................................................................................182
Lock / Unlock SMDR from Console ......................................................................................................................182
Macro Keys.............................................................................................................................................................182
Mute ........................................................................................................................................................................183
Operator Set Timed Reminder or Wakeup (Remote Setup) ...............................................................................183
Operator Timed Reminder or Wake Up................................................................................................................183
Paging.....................................................................................................................................................................183
Pulse To Tone Conversion ....................................................................................................................................184
Room Monitor.........................................................................................................................................................184
Saved Number Redial............................................................................................................................................184
Saved Number Redial (SuperSave)......................................................................................................................185
Shift Key..................................................................................................................................................................185
Speed Dialing .........................................................................................................................................................185
Speed Dial Programming.......................................................................................................................................185
Speed Dial Programming (Operator)....................................................................................................................186
Station Lock / Unlock .............................................................................................................................................187
Switching between Handsfree and Handset mode...............................................................................................187
Timed Reminder or Wake Up................................................................................................................................188
Trunk Queuing........................................................................................................................................................188
Trunk Group Access (Dial 9).................................................................................................................................188
Voice Service Unit (Operator Function).................................................................................................................189
Voice Mail Access...................................................................................................................................................189
Voice Mail Live Call Recording..............................................................................................................................190

TransTel Model TD-824-I Digital Telephone System – Table Of Contents
Page 9
Voice Mail Message Retrieval ...............................................................................................................................190
Voice Mail Transfer Key.........................................................................................................................................190
Volume Control......................................................................................................................................................190
Volume Levels Programming (Permanent)..........................................................................................................191
Access Control Phone Operation Manual................................................................................................................192
Intercom (as doorphone).......................................................................................................................................192
Intercom (as Hotline, to external telephone number)
G1-a10b
...............................................................................192
Outgoing call (as wall mount phone)....................................................................................................................192
Access via password .............................................................................................................................................192
Access via proximity card(Touch-N-Go)...............................................................................................................192
Access via password and proximity card ..............................................................................................................192
Check out (lock) ACP (as wall mount phone)......................................................................................................193
Burglary Report......................................................................................................................................................194
Time Display..........................................................................................................................................................194
As a wall mount phone..........................................................................................................................................194
ACP Related Programming......................................................................................................................................194
Extension Number length for ACP........................................................................................................................194
’Voice’ announce or ‘ring’ announce for ACP.......................................................................................................194
Hunt group for ACP..............................................................................................................................................194
Hunt Group Pilot Number......................................................................................................................................194
Hunt Group Members............................................................................................................................................194
Station Hunt Group Ringing Method.....................................................................................................................194
Station Function Form 46-st-08.............................................................................................................................195
Dial 9 Access (System Option)..............................................................................................................................195
Forced Account Code for ACP (as wall mount phone)........................................................................................195
Password for ACP (as doorphone).......................................................................................................................195

TransTel Model TD-824-I Digital Telephone System - General Description - Installation - Programming Forms Manual
Page 10 Version 1.3b October 2005
Includes all versions through G1-a20x
General Description - Introduction
The General Description section contains an easyto understand overview of the TransTel
®
TD-824i Digital
Telephone System. It is the intent of this document to provide both technical and non-technical readers with
information pertaining to the system building blocks, capabilities, key highlights, electrical, physical and
environmental characteristics of the TransTel TD-824i Digital Telephone System.
FCC Rules and Regulation
In compliance with the requirements of Part 68 of the Federal Communications Commission Rules and Regulations
for connection of terminal system equipment to the telephone network and for your convenience, the following
information is presented.
FCC Registration Number
The TransTel TD-824i is registered with the as a key system. The FCC Registration Number is 3A7TAI-35152-KF-
E for key systems registration.
Ringer Equivalence Number
Ringer Equivalence 0.3B.
Notification of the Telephone Company
Customers connecting terminal equipment to the telephone network shall, upon request of the
Telephone Company, inform the Telephone Company of the particular line(s) to which such
connection is made, the FCC registration number and ringer equivalence number (REN) of the
registered terminal equipment.
The REN is useful to determine the quantity of devices you may connect to your telephone line
and still have all of those devices ring when your telephone number is called. In most, but not all
areas, the sum of the REN's of all devices connected to one line should not exceed five (5.0). To
be certain of the number of devices you may connect to your line, as determined by the REN,
you should contact your local telephone company to determine the maximum REN for your
calling area.
Direct Connection to a Party-Line or Coin Operated Telephone Line is Prohibited.
Incidence of Harm to the Telephone Lines
Should terminal equipment cause harm to the Telephone Network, the Telephone Company shall, where practical,
notify the customer that service may be temporarily discontinued. However, where prior notice is not practical, the
Telephone Company may temporarily discontinue service, if such action is reasonable in the circumstances. In
case of such un-notified temporary discontinuance of service, the Telephone Company shall:
(a) Promptly notify the customer of such temporary discontinuance of service.
(b) Afford the customer the opportunity to correct the situation which gave rise to the temporary
discontinuance.
(c) Inform the customer of the right to bring a complaint to the FCC pursuant to the procedures set
out in Subpart E of Part 68 of FCC Telephone Equipment Rules.