Linksys SPA-941 Instruction Manual

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
1
Linksys, Inc.
SPA941 Administration Guide
October 2005
Version 0.1 (DRAFT)

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
2
Disclaimer – Please Read:
This document contains implementation examples and techniques using Linksys, Inc.
and, in some instances, other company’s technology and products and is a
recommendation only and does not constitute any legal arrangement between Linksys,
Inc. and the reader, either written or implied. The conclusions reached and
recommendations and statements made are based on generic network, service and
application requirements and should be regarded as a guide to assist you in forming your
own opinions and decision regarding your particular situation. As well, Linksys reserves
the right to change the features and functionalities for products described in this
document at any time. These changes may involve changes to the described solutions
over time.
Use of Proprietary Information and Copyright Notice:
This document contains proprietary information that is to be used only by Linksys
customers. Any unauthorized disclosure, copying, distribution, or use of this information
is prohibited.
Please Note:
Design and specifications are subject to change without notice.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
3
Table of Contents
1HOW TO USE THIS DOCUMENT.......................................................................................................8
2IMPORTANT OPERATING INFORMATION........................................................................................8
Compliance and Safety Information..........................................................................................................8
Network and Service Configuration Settings.........................................................................................10
3SPA941 OVERVIEW..........................................................................................................................10
SPA941 Hardware Features:....................................................................................................................11
SPA941 Functionalities ............................................................................................................................12
Navigating the SPA941 GUI......................................................................................................................13
Definitions for the Four Call Appearances.............................................................................................14
4CALL FEATURES ..............................................................................................................................15
Selecting Audio I/O Device and Line.......................................................................................................15
Making Calls ..............................................................................................................................................16
Answering Calls ........................................................................................................................................17
Ending Calls ..............................................................................................................................................17
Hold and Resume......................................................................................................................................17
Call-Waiting ...............................................................................................................................................17
Three way Conference..............................................................................................................................18
Attended Call Transfer..............................................................................................................................18
Blind Call Transfer....................................................................................................................................19
Call Back....................................................................................................................................................19
Message Waiting Indication (MWI)..........................................................................................................20
Accessing Voice Mail................................................................................................................................20
Muting Calls...............................................................................................................................................20
Shared Call Appearances.........................................................................................................................20
Line Key LED Behavior.............................................................................................................................21
Other Supplementary Services................................................................................................................22
Block Caller ID...........................................................................................................................................22
Block Anonymous Call.............................................................................................................................22
Do Not Disturb (DND)................................................................................................................................22

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
4
Secure Call.................................................................................................................................................22
Secure Call Implementation:....................................................................................................................22
User Interface .........................................................................................................................................23
Service Provider Requirements..............................................................................................................24
5MEMORY FEATURES AND OTHER USER ACCESSIBLE SETTINGS...........................................25
Call Logs....................................................................................................................................................25
Personal Directory....................................................................................................................................26
Entering and Saving Settings..................................................................................................................27
Preferences................................................................................................................................................28
Speed Dials................................................................................................................................................28
Caller and Called Name Matching...........................................................................................................29
Dialing Assistance....................................................................................................................................29
Time/Date...................................................................................................................................................29
Daylight Saving Time................................................................................................................................30
Checking Phone Status............................................................................................................................31
Reboot and Restart...................................................................................................................................31
Factory Reset ............................................................................................................................................31
Password Protection ................................................................................................................................32
Audio Volume Adjustment.......................................................................................................................32
Ring Tone...................................................................................................................................................32
Star Code to Activate/Deactivate Certain Services ...............................................................................33
Disabling Services....................................................................................................................................35
6VOICE AND SIGNALING FEATURES...............................................................................................36
SIP Proxy Dynamic Redundancy: ...........................................................................................................36
Re-registration with Primary SIP Proxy Server......................................................................................36
Codec Name Assignment.........................................................................................................................36
Voice Algorithms: .....................................................................................................................................37
G.711 (A-law and mµ-law)......................................................................................................................37
G.726......................................................................................................................................................37
G.729A....................................................................................................................................................37
G.723.1...................................................................................................................................................37
Codec Selection........................................................................................................................................37

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
5
Dynamic Payload ......................................................................................................................................37
Adjustable Audio Frames Per Packet.....................................................................................................37
DTMF: In-band & Out-of-Band (RFC 2833) (SIP INFO *)........................................................................38
Call Progress Tone Generation...............................................................................................................38
Call Progress Tone Pass Through..........................................................................................................38
Jitter Buffer – Dynamic (Adaptive)..........................................................................................................38
Voice Activity Detection with Silence Suppression & Comfort Noise Generation.............................38
Configurable Dial Plan with Interdigit Timers........................................................................................38
Network Address Translation (NAT) Traversal......................................................................................40
VoIP-NAT Interworking.............................................................................................................................40
7DATA NETWORKING FEATURES SUPPORTED............................................................................41
MAC Address (IEEE 802.3)....................................................................................................................42
IPv4 – Internet Protocol Version 4 (RFC 791) upgradeable to v6 (RFC 188.........................................42
ARP – Address Resolution Protocol.......................................................................................................42
DNS – A Record (RFC 1706), SRV Record (RFC 2782).......................................................................42
DiffServ (RFC 2475) and ToS – Type of Service (RFC 791/1349) ........................................................42
DHCP Client – Dynamic Host Configuration Protocol (RFC 2131)........................................................42
ICMP – Internet Control Message Protocol (RFC792)...........................................................................42
TCP – Transmission Control Protocol (RFC793)...................................................................................42
UDP – User Datagram Protocol (RFC768).............................................................................................42
RTP – Real Time Protocol (RFC 1889) (RFC 1890)..............................................................................42
RTCP – Real Time Control Protocol (RFC 1889)...................................................................................42
SRTP - Secure Real Time Control Protocol (RFC XXXX).....................................................................42
8CONFIGURING AND PROVISIONING OVERVIEW.........................................................................42
9WEB INTERFACE ADMINISTRATION AND SECURITY..................................................................42
Web Interface Conventions......................................................................................................................43
Web Interface Administration Privileges................................................................................................43
Web Interface Basic and Advanced Views.............................................................................................44
10 SPA941 CONFIGURATION PARAMETERS.....................................................................................44
Notations....................................................................................................................................................45
Data Types.................................................................................................................................................45
System Parameters...................................................................................................................................51
System Configuration ..........................................................................................................................51
Network Configuration.........................................................................................................................51
Provisioning Parameters..........................................................................................................................52

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
6
SIP Parameters..........................................................................................................................................54
Regional Parameters ................................................................................................................................59
Phone Parameters.....................................................................................................................................66
Extension 1 – 4 Parameters .....................................................................................................................69
User Parameters........................................................................................................................................74
Info Parameters (Read Only)....................................................................................................................75
11 DIAL PLAN.........................................................................................................................................77
12 PROVISIONING OVERVIEW.............................................................................................................81
Provisioning ..............................................................................................................................................81
Provisioning Capabilities.........................................................................................................................81
Configuration Profile ................................................................................................................................82
13 PROVISIONING FLOW......................................................................................................................84
Pre-Provisioning .......................................................................................................................................84
Provisioning Proper..................................................................................................................................84
14 FIRMWARE UPGRADE.....................................................................................................................85
Premium Features.....................................................................................................................................86
15 FUNCTIONAL URLS FOR UPGRADES, REBOOT AND RESYNCH...............................................86
Upgrade URL .............................................................................................................................................86
Resync URL...............................................................................................................................................86
Reboot URL ...............................................................................................................................................87
16 PERFORMANCE REPORTING FEATURES.....................................................................................87
Call Statistics and Reporting...................................................................................................................87
Report Generation and Event Logging...................................................................................................88
Error and Log Reporting ..........................................................................................................................89
Syslog and Debug Server Records.........................................................................................................89
17 TROUBLESHOOTING.......................................................................................................................89
Phone does not “turn on” or “boot up”....................................................................................................89
Phone will not make or receive calls. .....................................................................................................90
Calls with Poor Voice Quality..................................................................................................................91
18 CUSTOMER SUPPORT METHODS .................................................................................................91
19 CARE FOR THE SPA941 PHONE.....................................................................................................92
Do not expose the phone to heat, sun, cold, water................................................................................92

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
7
Cleaning the phone.................................................................................................................................92
20 ACRONYMS.......................................................................................................................................93
21 GLOSSARY........................................................................................................................................94

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
8
•How to use this document
This Administration Guide provides instructions on managing and operating the SPA941 IP Telephone.
The Guide covers the following topics:
•General Operating Information
•Call, Voice, Signaling Features, and Hardware Functionality Descriptions
•Configuration, Performance, and Troubleshooting Guidelines
•Provisioning
The SPA941 User Guide provides more details on how to use the phone’s features via the phone’s
physical interfaces, including the softkeys, display menus, the key pad, and dedicated buttons. The
Administrative Guide is helpful for network administrators that need detailed information on how to
configure the phone from the phone’s Web Server, or need access to the phone’s troubleshooting and
performance functions. Finally, the document also covers provisioning of the SPA941.
•Important Operating Information
Please insure the safe operation of the SPA941 by following the operating instructions in this section.
Compliance and Safety Information
This equipment has been tested and found to comply with the limits for a Class B digital device in
accordance with the specifications in part 15 of the FCC rules. This product bears the CE Marking
indicating compliance with the 89/336/EEC directive. Standards to which conformity is Declared: EN
61000-4-2:1995, EN 61000-4-3:1997, EN 61000-4-4:1995, EN 61000-4-5:1995, EN 61000-4-6:1996, EN
61000-4-8:1994, EN 61000-4-11:1994, EN 61000-3-2:2001, EN 61000-3-3:1995 & EN 55022:1998 Class
B Modifications to this product not authorized by Linksys could void FCC approval, thereby terminating
end user authority to use this product.
For indoor use only.
Read installation instructions before connecting to a power source. The electric plug and socket must be
accessible at all times as this is the main method to disconnect power from the device.
Shock Hazard:
Do not operate near water or similar fluid.
Do not work with this device during periods of lightning activity.
Do not touch wires at the end of cables or within sockets.
One Year Limited Hardware Warranty
Linksys provides a one (1) year limited hardware warranty. Linksys warrants to customer that this product
will conform to its published specifications and will be free from defects in material and
workmanship at the time of delivery and for a period of one year thereafter. Without limiting the

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
9
foregoing, this warranty does not cover any defect resulting from (i) any design or specification supplied
by an entity other than Linksys, (ii) non-observance of technical operating parameters (e.g., exceeding
limiting values), or (iii) misuse, abuse, abnormal conditions or alteration by anyone other than Linksys.
Replacement, Repair, Refund:
After the receipt of an RMA (Return Materials Authorization) request, Linksys will attempt to refund, repair
or replace this device. To receive an RMA number for this device, contact the party from whom it.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
10
Network and Service Configuration Settings
This unit may have been supplied by or sponsored by a telephone service provider. If so, the service
provider or network administrator who supplied the unit may have provided a pre-configuration of the
network and service settings. Depending on the configuration policy, end user access to the local
configuration settings may be restricted or inaccessible. Therefore, some of the network and service
configuration setting instructions described in the following sections may not be available on all units.
•SPA941 Overview
The SPA941 is a SIP based IP telephone offered by Linksys, a division of Cisco Systems. The SPA941
supports up to four phones lines of operation. It has a pixel-based display and a graphical user interface
that provides access to the phone’s functions and features. Figure 1.1 shows an illustration of the phone.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
11
Figure 1.1: SPA941: Linksys IP Phone
SPA941 Hardware Features:
•Pixel Based Display: 128x64 Monochrome Graphical Liquid Crystal Display (LCD)
•Four Illuminated Call Appearance Line Buttons with Tricolor LEDs
oLED Indicates Line State – Active, Idle, On-Hold, Unregistered
oLine LED Configurable to 13 Different States (On/Off, Color, Flash)
•Dedicated Illuminated Buttons for:
oAudio Mute On/Off
oHeadset On/Off
oSpeakerphone On/Off
•Four Soft Key Buttons
•Four Way Rocking Direction Knob for Menu Navigation

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
12
•Voice Mail Message Waiting Indicator Light
•Voice Mail Message Retrieval Button
•Dedicated Call Hold Button
•Menu / Settings Button for Access to Feature, Set-up and Configuration Menus
•Volume Control Up/Down Rocking Knob Controls Handset, Headset, Speaker, Ringer
•Standard 12-Button Dialing Pad
•High Quality Handset and Cradle
•Built-In High Quality Microphone and Speaker
•Headset Jack – 2.5 millimeter
•Ethernet LAN – 10BaseT RJ-45
•Five volt DC Universal (100-240 Volt) Switching Power Adapter
•LED Test Function
SPA941 Features and Functions
•Up to Four Call Appearances with Independent Configuration and Registration
The SPA941 ships with two line appearances enabled. A two line upgrade is available via a
software license key installed locally using the SPA941 web interface, or installed remotely
via a secure profile update.
•Pixel Based Display: 128x64 Monochrome Graphical Liquid Crystal Display (LCD)
•Line Status - Active Line Indication, Name and Number
•Menu Driven User Interface
•Digits Dialed with Number Auto-Completion
•Shared Line Appearance **
•Full-Duplex Speakerphone
•Call Hold
•Music on Hold **
•Call Waiting
•Caller ID Name and Number
•Outbound Caller ID Blocking
•Call Transfer - Attended and Blind
•Call Conferencing
•Automatic Redial
•On-hook Dialing
•Call Pick Up - Selective and Group **
•Call Park and UnPark **
•Call Swap
•Call Back on Busy
•Call Blocking - Anonymous and Selective
•Call Forwarding - Unconditional, No Answer, On Busy
•Hot Line and Warm Line Automatic Calling

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
13
•Call Logs (60 entries each): Made, Answered, and Missed Calls
•Redial from Call Logs
•Personal Directory with Auto-dial (100 entries)
•Called Number with Directory Name Matching
•Call Number using Name - Directory Matching, Log Matching, or via Caller ID
•Subsequent Incoming Calls with Calling Name and Number
•URI (IP) Dialing Support (Vanity Numbers)
•Configurable Dial Plans with Auto-Completion of dialed number
•Do Not Disturb (callers hear line busy tone)
•On Hook Default Audio Configuration (Speakerphone and Headset)
•Multiple Ring Tones with Selectable Ring Tone per Extension
•Date and Time with Intelligent Daylight Savings Support
•Call Timer
•Call Duration and Start Time Stored in Call Logs
•Name and Identity (Text) Displayed at Start Up
•Distinctive Ringing Based on Calling and Called Number
•Ten User Downloadable Ring Tones - Ring Tone Generator Free from www.linksys.com
•Speed Dialing
•Configurable Dial/Numbering Plan Support - per Line
•DNS SRV and Multiple A Records for Proxy Lookup and Proxy Redundancy
•Syslog, Debug, Report Generation, and Event Logging
•SecureCall Encrypted Voice Communication Support
•Built-in Web Server for Administration and Configuration with Multiple Security Levels
•Automated Provisioning, Multiple Methods. Up to 256 Bit Encryption: (HTTP, HTTPS, TFTP)
•Optionally Require Admin Password to Reset Unit to factory Defaults
** Feature requires support by callserver
Navigating the SPA941 Graphical User Interface
Note: Although this guide provides an overview of how to navigate the SPA941 Graphical User Interface
(GUI), its primary focus is to describe the administrative functions available via the phone’s web interface.
For more detailed discussion of the phone’s user interface, please refer to the SPA941 User Guide.
The user can invoke the phone’s GUI by pressing the menu button, and can navigate through the menus
using the round directional rocker knob and the soft keys. The menus are hierarchical. The select soft
key appears when a menu entry has a sub-menu. The sub-menu is entered by pressing the select soft
key, and exited by pressing the cancel soft key. The menus can be exited, and the phone returned to it
default display, by pressing the menu button.
The phone has four soft keys, but at times, more than four functions can be performed with the soft keys.
When this occurs, a small triangle appears at either the bottom right or the bottom left corner of the
display. This indicates that more soft key functions can be accessed by pushing the four way rocker knob
right or left respectively.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
14
Up to four menu items can be displayed at one time. The entries in each menu can be cycled through in
a circular fashion by pressing the up and down arrows on the directional rocker knob. Pressing the down
arrow when the last entry in a menu is selected causes the cursor to move back to the top entry in the
menu list. Press the up arrow when the first menu entry is selected causes the cursor to move to the last
entry in menu.
While the user is navigating the menus down to a leaf level item, a number is displayed on the left side of
each menu entry that indicates its position in the current menu list. A menu item can be directly accessed
by typing its number on the keypad, even if the item isn’t currently visible on the display. For instance,
when the menu key is pressed to display the top level menus, items one through four are displayed. Item
nine can be immediately entered by pressing the 9key on the keypad, without having to scroll down to
that item. Similarly, the fifteenth item in a menu can be entered by pressing the 1key followed by the 5
key, with less than a two second pause between the key presses. Any leading 0entries are ignored.
Some of the entries in the menus, such as those in the Status menu, are only informational; these entries
cannot be changed from within the menus. Typically only the cancel soft key is active when informational
menu entries are displayed.
The changeable menu entries can be modified by pressing the select soft key while the entry is
highlighted. The soft keys change to display the list of choices to modify the selected phone feature, such
as add, paste, edit, and delete. The modified entry can be saved by pressing the save soft key, or
discarded by pressing the cancel soft key.
A menu item’s display string may be wider than what can be displayed. When the user highlights a wide
item, the SPA941 automatically scrolls the contents horizontally from right to left so that the user can view
the entire text string.
Definitions for the Four Call Appearances
Some definitions:
•Station: A SPA941 phone (or a similar device in the Linksys SPA family) with one or more
Extensions and Call appearances provisioned
•Ext: An extension in the SPA941 is a VoIP account in a voice service provider (VSP)’s network or
an IP-PBX system. An extension can be uniquely identified with a User ID (like a phone number)
that is unique within the VSP. Up to 4 extensions can be configured in the SPA941, which are
refered to as Ext 1, Ext 2, Ext 3, and Ext 4 (or simply E1, E2, E3, and E4 respectively). Note that
the same extension can be configured on more than one station. These extensions are called
Shared Extensions. Extension 1 is referred to as the Primary Extension. Some features can only
be activated on the Primary Extension, such as Call Forwarding and Voice Mail Waiting Indicator
(VMWI).
•Call Appearance: Physically a call appearance corresponds to a Line Key on a station. There are
four Line Keys on the SPA941, which are referred to as Line Keys 1, 2, 3, and 4, or, L1, L2, L3,
and L4 respectively). Functionally, a call appearance is an instance of an extension. If an
extension is assigned to Line Keys on multiple stations, it is a Shared Line Appearance. One

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
15
extension can be assigned to multiple Line Keys on a SPA941. In fact, all four call appearances
can be instances of the same extension. (This extension is not a Shared Line Appearance
unless it is also assigned to a Line Key on another station.) Any of the four Line Keys can be
disabled. Each call appearance supports one call at a time, either active or on hold.
•VoIP Interface (VI): An Extension and its associated control parameters configured on a particular
station. The SPA941 includes a rich set of configuration parameters to control the operation
when calling via the account. Configuring an extension on the SPA941 includes configuring the
core account information and the set of VI control parameters. While the account information is
usually the same for a shared extension on different stations, the rest of the VI parameters can be
different. For example, the dial plan or the preferred codec to use when making a call on this
extension could be different for two different stations sharing the extension.
•Call Appearance State (CAST): The state of a call appearance which can be one of the following:
oDisabled: The Line Key is disabled
oIdle (Ready): The Call Appearance is ready for use
oDialing: Collecting digits from the user to be dialed out from this Line
oCalling: Waiting for the called party to respond
oProceeding (a.k.a. Progressing): Called party’s station is ringing
oRinging (a.k.a. Alerting): Incoming call, station is ringing
oConnected: Connected with remote party
oHeld: Remote party is on hold
oInvalid: Remote party hangs up or error while attempting outbound call
oBusy: the line is being used by another station (shared line only)
•Call State: A Call Appearance State followed by the term “Call”. For example, a Ringing Call, a
Dialing Call
•Active (Call) State: If the state is Dialing, Calling, Proceeding, Connected, or Invalid. When the
state of the Call is Active, it is referred to as an Active Call
•Standby (Call) State: the state is Ringing or Holding. When the state of the Call is Standby, it is
referred to as a Standby Call
•Key: Any one of the keys on the SPA941 keypad. A Key has two states: down (when pressed),
and up (when released)
•Button – a Key with an on and off state. The on/off state toggles when the key is pressed down
where applicable. There are 3 buttons on the SPA941: SPEAKER, HEADSET, and MUTE. Each
button has an associated LED that indicates the on/off state.
•SK(label) – Soft key with the given label, such as SK(select), SK(cancel), SK(dial), SK(conf),
SK(xfer)
•Call Features
Selecting Audio I/O Device and Line
There are three sets of audio I/O devices available: a) Handset, b) Built-in microphone and speaker, and
c) External microphone and headset. The speaker is also used for ringing. For convenience, where the
context is clear, these are referred to as (b) the speaker, and (c) the headset.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
16
Only one audio device can be selected at anytime. The speaker is selected by pressing the SPEAKER
button. The headset is selected by pressing the HEADSET button. When the SPEAKER or HEADSET is
selected, the corresponding LED will be steady GREEN. The handset is selected whenever it goes from
the on-hook to the off-hook position. Hence selecting or turning on of any of the audio device is equivalent
to an off-hook action, while turning off of any of the audio devices while it is equivalent to an on-hook
(hang-up) operation.
When there are no active calls, all audio devices are deselected. When any one of the calls becomes
active, the handset will be selected automatically as the audio device if it is off-hook, else the speaker or
the headset will be selected according to configuration: the user can configure whether speaker or the
headset device has higher preference.
A line is selected by pressing the corresponding Line Key.
To make or receive calls, the user must select a call appearance (Line Key) or an audio device. If the
user selects a call appearance, then an audio device is selected automatically according to user’s
preference setting. If the user selects an audio device, an idle call appearance is selected automatically
in the order L1, L2, L3, and L4. The user may switch between audio devices while the call in any of the
active states.
Exception: When a new call appearance is selected automatically when the user presses the conf soft
key or the xfer soft key, the SPA941 will attempt to pick an idle call appearance that is on the same
Extension as the last active call. If that call appearance is not available, the SPA941 attempts to pick one
whose Extension has the same Proxy server as the last active call. Finally, if that fails, the first idle call
appearance is selected, in the order L1, L2, L3, L4.
Making Calls
There are two steps in making a call:
1) Select an audio device, and
2) Dial the number.
The SPA941 allows the user to perform these two steps in either order. In other words, the user can
select an audio device either before or after dialing.
The SPA941 supports two types of dialing: explicit or implicit. Explicit dialing refers to one of the following
cases:
•enter the target number digits one by one
•enter the speed dial assignment of the target number
•select an entry from a directory, and press the dial soft key
•press a dedicated key, such as the Voice Mail key
“Implicit dialing” refers to dialing a highlighted entry from one of the device’s directories or logs. A number
can be implicitly dialing by selecting an audio device while the number is highlighted on the display.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
17
If an audio device is selected prior to dialing, then only explicit dialing is supported. Both explicit and
implicit dialing are allowed if the audio device is selected after dialing. Explicit dialing before the audio
device is selected is called “on-hook dialing”.
When an audio device is selected before dialing, a call appearance (for making the call) is also indirectly
selected. The SPA941 will pick the first available call appearance, in descending order, starting with Line
Key One. If no call appearances are available, no audio devices are selected.
A call appearance can be explicitly selected by pressing the corresponding line key. An audio device is
selected automatically based on the device’s programmed preferences. (Set by pressing menu Æ
Preferences ÆPreferred Audio Device, or by accessing the User tab of the web based interface.
Answering Calls
A line key LED rapidly blinks red when a call is incoming. The user can answer the call by:
•Selecting an audio device.
The SPA941 will answer the ringing call. If there are simultaneous incoming calls, the call ringing on
the lowest numbered line key is answered.
•Pressing the corresponding Line Key. The default audio device will be automatically selected.
Ending Calls
When a call is in the active state (not on hold or parked), the call can be ended by turning off the currently
selected audio device. A call in a standby state cannot be ended; it must be brought back to the active
state first.
Hold and Resume
An active call can be placed on hold by
•explicitly pressing the Hold key, or by
•pressing another Line Key (to answer an incoming all, resume a held call, or start a new call).
When a call is on hold, the corresponding Line Key LED slowly blinks red. To resume a call that is on
hold, press the corresponding Line Key.
When the phone is hosting a three way conference, two call appearances are in the connected state.
Pressing the Hold key places both calls on hold. The calls can be individually brought back to the
connected state by pressing the corresponding Line Keys.
Call Waiting
The Call Waiting function is activated when a device has a call in the active state and another call is
incoming. The phones in the SPA series do not support multiple calls on the same Line Key. Incoming
calls are assigned to an unused Line Key, causing the Line Key to quickly blink red. (Note that the Voice
Mail Waiting Indicator also blinks red whenever there is an incoming call.) The phone will not ring.
However, to alert the user, the call waiting tone is played into the active audio device.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
18
The SPA941 allow multiple lines to simultaneously cause Call Waiting. All four call appearances can ring
at the same time, after one of the Extension Keys is answered, the other three call appearances will go
into the Call Waiting state.
Three Way Conferencing
There are two ways to initiate a three way conference on the SPA941:
•During an active call, if the phone has one or more idle call appearances, press the conf soft key.
This places the active call on hold and selects the next available call appearance for dialing (the dial
tone is heard in the active audio device). Dial the third party, the party to be added to the conference
call. After the third party’s line rings or is answered, presses the conf soft key again to join the two
calls into a conference.
•If the phone has a call is on hold while another call is either ringing or is connected, the confLx soft
key appears. If the phone has only one call on hold, pressing the confLx soft key joins the call on
hold with the active call. If the phone has more than one call on hold, pressing the confLx soft key
places the active call on hold and prompts the user to select the other Line Key to join with the
conference call.
Once the conference starts, the SPA941 plays a special brief tone to all three parties to indicate that a
conference call is in progress. The initiator of the conference call can terminate it at any time by hanging
up. The initiator leave the conference without ending the call by pressing join soft key; this allows the
other two parties to continue the call. This is implemented as a call transfer, which may not work if the
other two parties are hosted by different service providers.
Note: If the extension is configured with an external Conference Bridge URL, then conference is not
limited to three way; it can be as many parties as the conference bridge supports. There are two
restrictions that apply when using an external conference bridge:
1) The conference can only be initiated (by pressing the conf soft key) when the third party has
answered, instead of when the phone is either ringing or answered, and
2) Ringing call cannot be brought into a conference by pressing the confLx soft key; only calls that
are on hold can be brought into the conference with the confLx soft key.
Attended Call Transfer
An attended call transfer allows a user to optionally transfer a call to a third party, after having a
discussion with that third party. There are two ways to perform an attended call transfer:
•During an active call, press the xfer soft key to place the current call on hold and to activate an idle
Line Key. Dialed the transfer target number on the newly activated line. When the target is either
ringing or answered, press the xfer soft key again to complete the transfer.
•While one or more call appearances is on hold, initiate a call on an idle Line Key. While the call is
either ringing or is connected, press the xferLx line key. If only one other call is on hold, the active

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
19
call is connected with the call on hold. Otherwise, the user is prompted to select which Line Key to
transfer the call to.
Notes:
•At the completion of call transfer operation, the holding call peer will be the transferee, and the
connected or proceeding call peer will be the transfer target.
•The case where a call transfer is completed when the transfer target is ringing is called a semi-
attended call transfer. This is different from a blind transfer which is described in the next subsection.
Blind Call Transfer
A blind transfer allows the user to transfer a call without speaking with the receiver of the transferred call.
For the user, the call ends as soon as the transfer target’s phone number is dialed. The underlying
mechanism is the user’s phone sends the contact information for the transfer target to the phone of the
other party on the call. The information is carried in a signaling message. When the message is sent, the
user’s phone is dropped from the call and the other party’s phone automatically dials the transfer target.
To perform a blind transfer press the bxfer soft key and then dial the target number. The bxfer soft key
will automatically become active during a call, but it may not be visible on the display. If the bxfer key is
not visible, press the left / right direction arrows on the directional rocker know until it scrolls onto the
display.
Some older SPA phones do not have bxfer soft keys. To perform a blind transfer on these older devices,
during the call, press the xfer soft key, or the Line Key of an unused line. (There must be a spare line
available to perform the transfer.) Once the new dial tone is heard, enter *98; the phone will prompt the
user to enter the phone number of the transfer target. Enter the number to complete the blind transfer. If
the user’s phone has more than one call on-hold on, the last call placed on hold will be the one
transferred.
Call Back
This service mimics the call back service offered by the PSTN. The user can activate this service on a
busy number such that he will be called back as soon as the busy number becomes available. The
SPA941 (and other members in the SPA family) implements this feature by repeatedly dialing the busy
number periodically until the called party rings or answers, or until the service order is canceled by the
user or expires. For that reason, it is better referred to as the repeat dialing service.
To activate this service, the user selects a Line key and enters *66 (Call back activation code). The
SPA941 then uses this call appearance to call the last called number. The retry period and expiration time
are configurable. To cancel the service, the user picks up any line and enter *86. When call back service
is active, the corresponding Line key will blink in green. The user can still use this line to make or answer
calls; when that happens the call back service is temporarily paused until the call appearance is idle
again.

DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
20
When the call back number rings or answers, the call appearance will ring also like a normal incoming call
(the ring to be used is the default ring for the corresponding extension for that Line key). If the call back
party answers the call before the local user does, the SPA941 sends holding tone to the call back party. If
the local user picks up the call back Line key first, he will hear ring back tone like a regular outbound call.
Message Waiting Indication (MWI)
The SPA941 indicates message waiting in 2 ways:
1. Turning on the red MWI light - LED (with an envelope icon right above LED) on the phone.
2. Playing stutter tone instead of regular dial tone. The MWI light only applies to new message
indication received on Extension 1. It will not be turned on or off due to new message indication
received on the other Extensions [2 – 4]. On the other hand, the SPA941 can be configured to play a
stutter tone on the individual call appearance according to the message waiting state of the
corresponding Extension “X”.
Accessing Voice Mail
The SPA941 has a VM retrieval key for quick access to voice mail. If a voice mail access number or URL
is not specified, pressing the key brings up a screen where the user can enter the appropriate
information. This information can also be entered from the web page or downloaded via provisioning.
The SPA941 will attempt to call the voice mail number or URL if there is an idle call appearance available.
Muting Calls
The user can mute the audio input into the phone when an audio device is switched on, by pressing the
MUTE key. To un-mute, press the MUTE key again. If no audio device is on, pressing the MUTE key has
no effect. When switching from the speaker phone to the handset, the phone is automatically un-muted.
Shared Call Appearances
The SPA941 supports shared call appearances in association with a Broadsoft application server. An
extension can be shared by two (2) or more stations. Any call appearances on a shared extension is a
shared call appearance. At any given time, each station sharing a call appearance can monitor the state
of the call appearance. A station can select a share call appearance to make a call only if the call
appearance is not being used by another station. All stations will ring on an inbound call to the shared
call appearance extension. Whoever picks up the call first will take the call. When a call is placed on
hold by one station, it can be resumed from another station sharing the same call appearance.
Additional methods for shared call appearances per vendor application server implementation are being
added to the SPA941 and will be available in future firmware releases. Please contact [email protected]
to inquire about roadmap / development schedules.