Grandstream Networks HT-503 User manual

Grandstream Networks, Inc.
HT503
FXS/FXO Port
Analog Telephone Adaptor
User Manual

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HT503 User Manual
COPYRIGHT
©2016 Grandstream Networks, Inc. http://www.grandstream.com
All rights reserved. Information in this document is subject to change without notice. Reproduction or
transmittal of the entire or any part, in any form or by any means, electronic or print, for any purpose without
the express written permission of Grandstream Networks, Inc. is not permitted.
The latest electronic version of this guide is available for download here:
http://www.grandstream.com/support
Grandstream is a registered trademark and Grandstream logo is trademark of Grandstream Networks, Inc.
in the United States, Europe and other countries.
CAUTION
Changes or modifications to this product not expressly approved by Grandstream, or operation of this
product in any way other than as detailed by this guide, could void your manufacturer warranty.
SAFETY COMPLIANCE
The HT503 adaptor complies with FCC/CE and various safety standards. The HT503 power adaptor is
compliant with UL standard. Only use the universal power adapter provided with the HT503 package.
The manufacturer’s warranty does not cover damages to the device caused by unsupported power
adaptors.

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HT503 User Manual
GNU GPL INFORMATION
HT503 firmware contains third-party software licensed under the GNU General Public License (GPL).
Grandstream uses software under the specific terms of the GPL. Please see the GNU General Public
License (GPL) for the exact terms and conditions of the license.
Grandstream GNU GPL related source code can be downloaded from Grandstream web site from:
http://www.grandstream.com/sites/default/files/Resources/ht5xx_gpl.tar.gz.

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HT503 User Manual
Table of Contents
CHANGE LOG................................................................................................................6
Changes from 1.0.15.5 User Manual.....................................................................................................6
Changes from 1.0.14.1 User Manual.....................................................................................................6
Changes from 1.0.13.3 User Manual.....................................................................................................6
Changes from 1.0.12.4 User Manual.....................................................................................................7
Changes from 1.0.12.1 User Manual.....................................................................................................7
Changes from 1.0.11.3 User Manual .....................................................................................................7
Changes from 1.0.10.9 User Manual.....................................................................................................7
Changes from 1.0.7.6 User Manual.......................................................................................................8
Changes from 1.0.6.8 User Manual.......................................................................................................8
GUI INTERFACE EXAMPLES........................................................................................9
WELCOME ...................................................................................................................10
CONNECT YOUR HT503 ............................................................................................. 11
Equipment Packaging..........................................................................................................................11
Connecting the HT503.........................................................................................................................11
PRODUCT OVERVIEW ................................................................................................ 16
Software Features Overview ...............................................................................................................16
Hardware Specification........................................................................................................................19
BASIC OPERATIONS...................................................................................................20
Understanding HT503 Voice Prompt ...................................................................................................20
Placing a Phone Call............................................................................................................................23
Phone or Extension Numbers.......................................................................................................23
Direct IP Calls ...............................................................................................................................23
Call Hold ..............................................................................................................................................24
Call Waiting..........................................................................................................................................25
Call Transfer.........................................................................................................................................25
Blind Transfer................................................................................................................................25

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Attended Transfer .........................................................................................................................25
3-Way Conferencing ............................................................................................................................26
PSTN Pass Through ............................................................................................................................26
VoIP-TO-PSTN Calls ...........................................................................................................................27
PSTN-TO-VoIP Calls ...........................................................................................................................28
Route Calls TO PSTN..........................................................................................................................29
Forward Calls TO PSTN ......................................................................................................................29
Forward Calls TO VoIP ........................................................................................................................29
One Stage Dialing................................................................................................................................30
FAX Support.........................................................................................................................................30
CALL FEATURES.........................................................................................................31
CONFIGURATION GUIDE ............................................................................................33
Configuring HT503 Through Voice Prompt..........................................................................................33
Configuring HT503 with Web Browser.................................................................................................33
Access the Web Configuration Menu ...........................................................................................34
Definitions ............................................................................................................................................35
Saving the Configuration Changes ......................................................................................................75
Rebooting from Remote.......................................................................................................................76
Configuration through a Central Server ...............................................................................................76
SOFTWARE UPGRADE ...............................................................................................78
Firmware Upgrade Through TFTP/HTTP/HTTPS ...............................................................................78
Instructions for local firmware upgrade................................................................................................79
Configuration File Download................................................................................................................79
Firmware and Configuration File Prefix and Postfix ............................................................................80
Managing Firmware and Configuration File Download........................................................................80
Restore Factory Default Setting.................................................................................82
Factory Reset.......................................................................................................................................82
Reset Button ........................................................................................................................................82
IVR Command .....................................................................................................................................82
EXPERIENCING THE HT503 .......................................................................................84

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HT503 User Manual
Table of Tables
Table 1: Definitions of the HT503 connectors .............................................................................................12
Table 2: HT503 LED Definitions ..................................................................................................................13
Table 3: Advanced definitions of the HT50x LEDs patterns........................................................................13
Table 4: HT503 Technical specifications .....................................................................................................16
Table 5: HT503 Hardware specification ......................................................................................................19
Table 6: HT503 IVR Menu definitions .........................................................................................................20
Table 7: HT503 Call feature definitions .......................................................................................................31
Table 8: Status page ...................................................................................................................................36
Table 9: Basic settings ................................................................................................................................37
Table 10: Advanced settings .......................................................................................................................43
Table 11: FXS Port settings.........................................................................................................................49
Table 12: FXO Port Settings........................................................................................................................64
Table of Figures
Figure 1: Connecting the HT503 .................................................................................................................12
Figure 2: Interconnection diagram of the HT503 ........................................................................................15
Figure 3: Uplink/Downlink bandwidth limitation...........................................................................................42

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HT503 User Manual
CHANGE LOG
This section documents significant changes from previous versions of HT503 user manuals. Only major
new features or major document updates are listed here. Minor updates for corrections or editing are not
documented here.
Changes from 1.0.15.5 User Manual
Added option to disable PnP subscribe feature [3CX Auto Provision]
Added option "DNS SRV use Registered IP" to control destination IP address for outbound request
under SRV mode [DNS SRV use Registered IP]
Split Layer 3 QoS into SIP and RTP [Layer 3 QoS]
Deactivated SIP INFO DTMF in SIP accept header. Added option "DTMF-RELAY Tag Respect SIP
INFO" [DTMF-RELAY Tag Respect SIP INFO]
Added configurable option to enable/disable Broadsoft Connected Line ID [Disable Connected Line ID]
Added TLS/SSL certificate domain and chain validation [Authenticate Server Certificate Domain]
Updated LED light patterns to match HT70x’s [Advanced definitions of the HT50x LEDs patterns]
Customized HT503 timer for outgoing calls via FXO [PSTN Idle Wait Timeout between Outgoing Calls]
Changes from 1.0.14.1 User Manual
Bugs fixed with no new feature added.
Changes from 1.0.13.3 User Manual
Added feature [Hold Target Before Refer] in profile settings, which allows user to hold or not hold the phone
call before refer.
Added feature [Crypto Life Time] in FXS port settings, which allows user to enable or disable Crypto life
time when using SRTP.
Added feature [Crypto Life Time] in FXO port settings, which allows user to enable or disable Crypto
life time when using SRTP.
Added feature [Play busy/reorder tone before Loop Current Disconnect] in profile settings, which allows

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HT503 User Manual
user to configure if it will play busy/reorder tone before loop current disconnect upon call fail.
Changes from 1.0.12.4 User Manual
Added option [SIP Timer D] to configure RFC 3261 timer D in Advanced Settings.
Changed option name from [Allow DHCP Option 66 to override server] to [Allow DHCP Option 66 or 160
to override server]. Now option160 will be accepted by unit along with option 66 when enabled.
Added feature [Download Device XML Configuration] in advanced settings, which allows user to
download device configuration to local directory in xml format.
Added feature [Upload firmware] in advanced settings, which allows user to upload firmware file from
local directory.
Added feature [Upload configuration] in advanced settings, which allows user to upload configuration
file from local directory.
Changes from 1.0.12.1 User Manual
Added the options to enable/disable [Always send HTTP Basic Authentication Information]
Added the options to restrict the m field sent in [Disable Multiple m line in SDP]
Changes from 1.0.11.3 User Manual
Added the options to enable/disable [Do Not Escape '#' as %23 in SIP URI]
Added network whist/black list function on WAN port [White list for WAN side] [Black list for WAN side]
Added settings for [PSTN Idle Wait Timeout between Outgoing Calls]
Changes from 1.0.10.9 User Manual
Added the options to enable/disable [Use P-Preferred-Identity Header] and [Use Privacy Header]
Added the option to enable/disable Authentication Header on Initial Register

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Changes from 1.0.7.6 User Manual
Added option to enable/disable SIP NOTIFY Authentication.
Added option [Use Configured IP ] in DNS mode. Added configurable parameter [Primary IP][Backup
IP1][Backup IP2]
Added option to set [Reregister before Expiration]
Changes from 1.0.6.8 User Manual
Added the option to enable/disable hook flash. [Enable Hook Flash]
Added two CPE SSL configuration [CPE SSL Certificate][CPE SSL Private Key]
Added a configuration parameter to set the [Connection Request Port]
Removed DHCP Domain from Web UI
Removed Enable Ring-transfer from Web UI
Added a configuration parameter to set the [Offhook Auto-Dial Delay]
Changed the SSL Web UI description to [SIP TLS Certificate][SIP TLS Private Key] and [SIP TLS Private
Key Password]
Added [CPE] version to Software Version on Web UI.

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GUI INTERFACE EXAMPLES
http://www.grandstream.com/sites/default/files/Resources/ht503_gui.zip
1. Screenshot of Configuration Login Page
2. Screenshot of Status Page
3. Screenshot of Basic Settings Configuration Page
4. Screenshot of Advanced Settings Configuration Page
5. Screenshot of FXS Account Configuration
6. Screenshot of FXO Account Configuration
7. Screenshot of Call Progress Tones Configuration Page
8. Screenshot of Saved Configuration Changes
9. Screenshot of Reboot Page

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HT503 User Manual
WELCOME
Thank you for purchasing Grandstream’s HT503, the affordable, feature rich, Analog Telephone
Adaptor/IAD. The HT503 combines a sleek design with the latest technology to offer more advanced
telephony features and significantly better integrated router performance than its predecessor –the
HT488. It is the second ATA/IAD in the HandyTone 50x series. The HT503 functions as a true 3-in-1
gateway for PSTN network, analog telephone FXS interface and IP network. It enables remote call
origination and termination from/to PSTN and supports the feature of “hop-on/hop-off” calling.
This manual will help you learn how to operate and manage your HT503 Analog Telephone Adaptor/IAD
and make the best use of its many upgraded features including simple and quick installation, 3-way
conferencing, and remote call origination and “hop-on/hop-off” calling using the programmable PSTN FXO
port. This HT503 is very easy to manage and configure, and is specifically designed to be an easy to use
and affordable VoIP solution for both the residential user and the remote user.

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HT503 User Manual
CONNECT YOUR HT503
Equipment Packaging
The HT503 ATA package contains:
One HT503 Main Case
One Universal Power Adaptor
One Ethernet Cable
One HT503 Vertical Stand
Connecting the HT503
The HT503 is designed for easy configuration and easy installation. Configure the HT503 following the
directions in the Configuration section of this manual.
1. Connect a standard touch-tone analog telephone to the PHONE port.
2. Insert a standard RJ11 telephone cable into the LINE port and connect the other end of the
telephone cable to a wall jack.
3. Insert the Ethernet cable into the WAN port of HT503 and connect the other end of the Ethernet
cable to an uplink port (a router or a modem, etc.)
4. Connect a PC to the LAN port of HT503 if it is being used as a router.
5. Insert the power adapter into the HT503 and connect it to a wall outlet.
The HT503 Analog Telephone Adaptor is an all-in-one VoIP integrated device designed to be a total solution
for networks providing VoIP services. The HT503 VoIP features and functions are available using a regular
analog telephone.

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HT503 User Manual
Figure 1: Connecting the HT503
The HT503 has one FXS port and one FXO port. The PHONE port next to the power supply is an FXS port.
The LINE port on the back right of the HT503 is an FXO port. Both the FXS port and the FXO port can have
a separate SIP account. This is a key feature of HT503 as it supports simultaneous calls on both the FXS
port and FXO port. Telephone calls can be originated from or terminated on the PSTN network remotely via
the FXO port.
Table 1: Definitions of the HT503 connectors
12VDC, 0.5A
Power adapter connection
LAN Port (RJ-45)
Connect the LAN port with an Ethernet cable to your PC.
WAN Port (RJ-45)
Connect the WAN port to the internal LAN network or router.
PHONE (RJ-11)
FXS port to be connected to analog phones / fax machines.
LINE (RJ-11)
FXO port should be connected to the PSTN line
HT503
Front View
HT503
Back View
Display LEDs
(Green)
RJ-45 Ports
10/100 Mbps
Reset
Power
Supply
RJ11
FXS Port
RJ11
FXO Port

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Table 2: HT503 LED Definitions
POWER LED
Indicates Power. Remains ON when power is connected
WAN LED
Indicates LAN (or WAN) port activity
LAN LED
Indicates PC (or LAN) port activity
PHONE/ LINE LED
Indicates the status of the FXS and FXO ports on the back panel.
Unregistered – OFF
Registered and Available – ON (Solid Green)
Off-Hook / Busy – Blinking every second
Slow blinking FXS LEDs indicates voicemail
Note: All LEDs display green when ON
Table 3: Advanced definitions of the HT50x LEDs patterns
LED-01
Device has normal power
Power
ON
LED-02
Power Error: Power is removed from the device or
power supply with improper voltage is plugged in
Power
OFF
LED-03
Line X is registered normally to the sip providers
network and is ready to make a call
Phone
ON
LED-04
Voice mail waiting for Line X
Phone
1sec ON / 3sec OFF
LED-05
Device has normal WAN connection and has obtained
IP address
Internet
ON
LED-06
Internet link error: Device is powered up and ready to
connect to the Internet but the WAN/INTERNET port
is down
Internet
OFF
LED-07
Internet DHCP Error: Device is properly connected
Internet
250ms ON/ 250ms

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but it is unable to retrieve an IP address from the
device it is connected to
OFF
LED-08
Line Registration failed: Device is properly setup,
can connect to provider's network, but cannot register
to provider's SIP proxy (no 200 OK)
Phone
2x1000ms ON/OFF
+
3sec OFF
LED-09
Device is connected (has physical data link) but there
are incorrect network settings typically associated
with PPPoE connection failure
Internet
250ms ON/ 250ms
OFF
LED-10
Hazardous potential test failed: Hazardous AC or DC
voltage is present on the tip and ring or both signals
of phone line X
Phone
1x250ms ON/OFF
+
3sec OFF
LED-11
Foreign electro Motive Force (EMF) Test fail. Foreign
voltage is present on the tip, ring or both signals of
phone line. Device has detected additional external
Phone voltage on the FXS phone line.
Phone
2x250ms ON/OFF
+
3sec OFF
LED-12
Resistive fault test failed. Either tip or ring is shorted
to ground or they are shorted to each other.
Phone
3x250ms ON/OFF
+
3sec OFF
LED-13
Receiver off hook test fail. One or more phones are off
hook on phone line during test.
Phone
4x250ms ON/OFF
+
3sec OFF
LED-14
REN test failed – high REN detected. Too many
parallel phones connected to phone line X
Phone
5x250ms ON/OFF
+
3sec OFF
LED-15
Line is active
Phone
500ms ON/OFF
LED-16
Line inactive
Phone
ON

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LED-17
During Provisioning Stage*
Internet /
Phone
500ms ON/OFF
LED-18
During Firmware Recovery Stage*
Internet /
Phone
250ms ON/OFF
LED-19
Line X is registered normally to the sip providers
network and is ready to make a call
Phone
2x1000 ms ON/OFF
+
3sec OFF
Figure 2: Interconnection diagram of the HT503
Internet ADSL/Cable
Modem Ethernet
Fax
Cordless
Analog Phone
WAN
LAN
FXS
FXO
PSTN
Cloud

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PRODUCT OVERVIEW
The HT503 is an affordable, high-quality, integrated IP telephony solution for both the residential customers
and the ‘road-warriors’ who need advanced call features between traditional PSTN network and IP network.
The HT503 enables IP connectivity for any phone or fax using the FXS port and a web-based GUI for easy
configuration and installation. It functions as a true FXO gateway that enables remote call origination and
termination from/to PSTN and supports the feature of “hop-on/hop-off” using the programmable FXO port.
Software Features Overview
The HT503 features 2 SIP account profiles and supports advanced telephony features including caller ID,
call waiting, call transfer, 3-way conferencing (with either IP or PSTN calls), and multi-language voice
prompts. From a technical standpoint, the HT503 offers a power-outage survivable life line and internet-
disconnect survivable fail-over-to-PSTN support, dual 10/100Mbps Ethernet ports with integrated high-
performance NAT router, a flexible dial plan and a broad range of popular voice codecs.
Table 4: HT503 Technical specifications
Interfaces
1 FXS telephone port (RJ11), 1 FXO PSTN line port (RJ11) with lifeline support
Two (2) 10M/100 Mbps ports (RJ45) with integrated Nat router
Protocol Support
TCP/UDP/IP, RTP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP,
PPPoE, STUN & TELNET protocols
LED Indicators
Power, WAN, LAN, PHONE, and LINE
RESET Button
Factory Reset Button

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Device Management
Web interface or via secure (AES encrypted) central configuration file for mass
deployment
Support device configuration via built-in IVR, Web browser or central
configuration file through TFTP, HTTP or HTTPS
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)
Auto/manual provisioning system
NAT-friendly remote software upgrade (via TFTP/HTTP/HTTPS) for deployed
devices including behind firewall/NAT
Syslog support
DHCP Server/Client
Yes
Audio Features
Advanced Digital Signal Processing (DSP)
Dynamic negotiation of codec and voice payload length
Support for G.723, G.729/E, G.711, G.726-40/32/24/16, iLBC, T.38 codecs
In-band and out-of-band DTMF (in audio, RFC2833, SIP INFO)
Silence Suppression, VAD (voice activity detection), CNG (comfort noise
generation), ANG (automatic gain control)
Adaptive jitter buffer control
Packet delay & loss concealment (PLC) & G.168 compliant Line Echo
Cancellation
Support volume amplification
Support configurable Call Progress Tones
Call Handling
Features
Caller ID display or block, Call waiting caller ID, Call waiting/flash, Call transfer,
hold, call forward, do not disturb, 3-way conferencing
Network and
Manual or dynamic host configuration protocol (DHCP) network setup; RTP and

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Provisioning
NAT support traversal via STUN
Fax over IP
T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for
Fax Pass-through, Fax Data pump V.17, V.19, V.27ter, V.29 for T.38 fax relay
Security
DIGEST authentication and encryption using MD5 and MD5-sess
Physical Design
Stylish and compact design; small universal power supply, ideal for travel

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Hardware Specification
The table below lists the hardware specification of HT503.
Table 5: HT503 Hardware specification
LAN interface
1xRJ45 10/100 Mbps Port
WAN interface
1xRJ45 10/100 Mbps Port
FXS telephone port
1 x FXS (RJ11)
FXO telephone port
(PSTN Port)
1x PSTN pass-through and life line port
LED
Power, WAN, LAN, PHONE, and LINE (Green)
Universal Switching
Power Adaptor
Input: 100–240 VAC, 50-60 Hz
Output: 12VDC, 0.5A, UL certified
Dimension
25mm x 115mm x 75mm (when laying flat);
115mm x 25mm x 75mm (standing up)
Weight
Approximately 0.6lbs (0.3kg)
Temperature
Operational: 32° - 104°F or 5° – 45°C
Storage: 10°–130°F
Humidity
10% - 90%
(non-condensing)
Compliance