ELTEX TAU-4M.IP User manual

TAU-4M.IP
Operation Manual
Firmware version 2.3.0
VoIP Gateway
IP address: http://192.168.1.1
Username: admin
Password: password
https://eltex-co.com/support/downloads/

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2 TAU-4M.IP Subscriber gateway
Document version
Issue data
Revisions
Version 1.2
31.01.2020
Updated according to firmware version 2.3.0
Version 1.1
28.05.2018
Updated according to firmware version 2.1.0
Version 1.0
15.01.2018
First issue
Firmware version
Firmware version: 2.3.0
Web-interface version: 2.3.0.53

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TAU-4M.IP Subscriber gateway 3
SYMBOLS
Symbol
Description
Bold font face
Notes, warnings, section headings, titles and table titles are written in bold.
Calibri Italic
Important information is written in Calibri Italic.
NOTES AND WARNINGS
Notes contain important information, tips, or recommendations on device
operation and setup.
Warnings inform users about hazardous conditions which may cause injuries or
device damage and may lead to the device malfunctioning or data loss.

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4 TAU-4M.IP Subscriber gateway
TABLE OF CONTENTS
INTRODUCTION ............................................................................................................................................... 6
1 PRODUCT DESCRIPTION ............................................................................................................................. 7
1.1 Purpose............................................................................................................................................... 7
1.2 Device specification............................................................................................................................ 7
1.3 Device Design and Operating Principle .............................................................................................. 9
1.4 Main Specifications........................................................................................................................... 11
1.5 Design ............................................................................................................................................... 12
1.5.1 Top panel of the device .......................................................................................................... 12
1.5.2 Rear panel of the device ......................................................................................................... 13
1.6 Light indication ................................................................................................................................. 13
1.7 Reset to factory settings................................................................................................................... 14
1.8 Delivery Package............................................................................................................................... 14
2 DEVICE MANAGEMENT VIA WEB CONFIGURATOR..................................................................................15
2.1 Getting started.................................................................................................................................. 15
2.2 Changing users.................................................................................................................................. 15
2.3 WEB interface operation modes ...................................................................................................... 16
2.4 Applying and discarding changes made to configuration ................................................................ 17
2.4.1 Applying configuration............................................................................................................ 17
2.4.2 Discarding changes ................................................................................................................. 17
2.5 ‘Quick configuration’ menu.............................................................................................................. 18
2.5.1 Internet................................................................................................................................... 18
2.5.2 VoIP......................................................................................................................................... 21
2.5.3 IPTV......................................................................................................................................... 22
2.5.4 System..................................................................................................................................... 22
2.6 Advanced settings............................................................................................................................. 23
2.6.1 WEB interface basic elements ................................................................................................ 23
2.6.2 'Network' menu ...................................................................................................................... 23
2.6.3 'VoIP' menu............................................................................................................................. 45
2.6.4 'IPTV' menu............................................................................................................................. 74
2.6.5 'System' menu......................................................................................................................... 75
2.7 System Monitoring ........................................................................................................................... 94
2.7.1 'Internet' submenu ................................................................................................................. 94
2.7.2 'VoIP' submenu ....................................................................................................................... 95
2.7.3 'Ethernet Ports' submenu....................................................................................................... 98
2.7.4 'DHCP' submenu ..................................................................................................................... 99
2.7.5 'ARP' submenu........................................................................................................................ 99
2.7.6 'Device' submenu.................................................................................................................. 100
2.7.7 'CPU' submenu...................................................................................................................... 100
2.7.8 'Conntrack' submenu............................................................................................................ 101
2.7.9 'Routes' submenu ................................................................................................................. 102
2.7.10 'Call History' submenu ....................................................................................................... 103
2.7.11 ‘Diagnostics’ submenu....................................................................................................... 104
2.8 Configuration example ................................................................................................................... 105
3 VALUE ADDED SERVICES USAGE ............................................................................................................108
3.1 Call Transfer.................................................................................................................................... 108
3.2 Call Waiting..................................................................................................................................... 111
3.3 Three-way conference.................................................................................................................... 111
3.3.1 Local conference................................................................................................................... 111
3.3.2 Remote conference .............................................................................................................. 113
4 CONNECTION ESTABLISHMENT ALGORITHMS....................................................................................... 114
4.1 Algorithm of a Successful Call via SIP Protocol............................................................................... 114
4.2 Call Algorithm Involving SIP Proxy Server....................................................................................... 115

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TAU-4M.IP Subscriber gateway 5
4.3 Call Algorithm Involving Forwarding Server................................................................................... 116
5 DEVICE AUTOMATIC UPDATE ALGORITHM BASED ON DHCP................................................................ 117
6 SYSTEM RECOVERY AFTER A FIRMWARE UPDATE FAILURE...................................................................120
APPENDIX A. CALCULATION OF PHONE LINE LENGTH ................................................................................121
APPENDIX B. RUNNING USER-DEFINED SCRIPT UPON SYSTEM STARTUP...................................................122
APPENDIX C. DHCP CLIENTS CONFIGURATION IN MULTISERVICE MODE................................................... 123

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6 TAU-4M.IP Subscriber gateway
INTRODUCTION
Today, VoIP is one of the most rapidly evolving telecommunication services. TAU-4M.IP series gateways
(hereinafter the "device") are designed to provide VoIP services to the network clients.
TAU-4M.IP VoIP gateway allows connecting analogue phones to packet-based data networks accessible via
Ethernet.
The device is intended for operation in home or small offices (SMB).
This operation manual describes intended use, key specifications, configuration, monitoring, and firmware
update for TAU-4M.IP VoIP gateways.

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TAU-4M.IP Subscriber gateway 7
1PRODUCT DESCRIPTION
1.1 Purpose
TAU-4M.IP is a high-performance VoIP gateway with the full set of features that allow users to take
advantage of VoIP functionality.
TAU-4M.IP gateway allows connecting an analogue phone or a fax modem to IP networks. With a built-in
router, the device enables connection of local network equipment to a broadband access network. It is possible
to connect one PC that will be able to access the Internet using integrated NAT/DHCP server features. The USB
port is used to connect external drive, 3G/4G USB modem.
1.2 Device specification
Interfaces:
FXS: 4 x RJ-11 ports
LAN: 1 x Ethernet RJ-45 10/100BASE-T port
WAN: 1 x Ethernet RJ-45 10/100BASE-T port
USB: 1 x USB2.0 port
The gateway is powered via 12V DC adapter for 220V electrical networks.
Functions:
Network functions:
–Operation in ‘bridge’ or ‘router’ mode;
–PPPoE support (PAP, SPAP and CHAP authorization, PPPoE compression);
–PPTP support;
–L2TP support;
–Static IP address and DHCP support (DHCP client on WAN side, DHCP server on LAN side);
–DNS support;
–NAT support;
–Firewall;
–NTP support;
–QoS support (QoS via DSCP and 802.1P);
IPTV function support;
VoIP protocols: SIP;
Echo cancellation (G.168 recommendations);
Voice activity detection (VAD);
Comfort noise generation;
DTMF signals detection and generation;
DTMF transmission (INBAND, rfc2833, SIP INFO);

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8 TAU-4M.IP Subscriber gateway
Fax transmission:
–G.711A/G.711U;
–T.38;
Operation w/ and w/o a SIP server;
Value Added Services (VAS):
–Call Hold;
–Call Transfer;
–Call Waiting;
–Call Forward at Busy;
–Call Forward at No answer;
–Call Forward Unconditional;
–DND (Do not disturb);
–Caller ID: FSK, DTMF;
–Hotline;
–Group call;
–Call Pickup;
–Three-way conference call;
–Flexible dial plan;
Firmware update via web interface;
DHCP-based auto provisioning support;
TR-069;
Remote monitoring, configuration and setup: web-interface, Telnet.
Figure1 shows TAU-4M.IP connection diagram.
Figure 1 –TAU- 4M.IP operation diagram

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TAU-4M.IP Subscriber gateway 9
1.3 Device Design and Operating Principle
TAU-4M.IP terminal consists of the following subsystems:
Controller that includes:
–Realtek RTL8972C highly-integrated System-on-a-Chip (SoC), including a CPU, 100 Mbit
switch with a built-in PHY, hardware L2/L3/L4 acceleration, USB 2.0 ports, PCI-E controller
and 8 PCM channels for VoIP applications;
–Flash memory –8MВ;
–SDRAM –128МВ.
4 x SLIC subscriber units;
1 x LAN port RJ-45 10/100BASE-T;
WAN Ethernet module: RJ-45 10/100BASE-T;
USB Host port.
Block diagram for the device is shown in Figure2.
Figure 2 –TAU- 4M.IP design diagram
The device runs under Linux operating system. Basic control functions are performed by Realtek processor
which enables IP packet routing, VoIP operation, group traffic proxying and etc.
The device may functionally be divided into four blocks:
Device network features block;
VoIP block;
Multicast traffic processing block;
Control block (Linux operating system).

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10 TAU-4M.IP Subscriber gateway
Device network features block enables IP packet transmission and switching according to the device
routing table. Depending on the network interface, this block can process both tagged and untagged packets.
Supports DHCP, PPPoE, PPTP, L2TP.
VoIP block enables SIP protocol operation for transmission of voice signals through the network that
features packet switching. Subscriber’s voice signal is transferred to the SLIC subscriber unit module, where it is
converted into digital form. The digitized signal is transferred to VoIP block to be encoded using one of the
selected standards and is transferred further in the form of digital packets to the controller via the intrasystem
backbone. In addition to voice signals, digital packets contain control and interaction signals.
Multicast traffic processing block enables processing of IGMP messages and multicast traffic for IPTV
functions support.
Control block based on Linux operating system monitors operation of all the other blocks and the device
subsystems and manages their interaction.
Fig 3 shows TAU-4M.IP functional diagram.
Figure 3 –TAU- 4M.IP functional diagram