Ru En
Designer and manufacturer of communication equipment
Russia (GMT +7)

VoIP Gateway TAU-8.IP

Currently Serviced
Mass production is over
Key features 
  • Office PBX functionality
  • 3G/4G channel reservation
  • IPsec encryption
  • TR-069/DHCP-based autoprovisioning
  • Maximum line length—6 km
  • Measurement of subscriber's line parameters
TAU-8.IP VoIP gateway is an optimal solution for provision of advanced VoIP services to corporate clients via analogue phone devices. 

Business solution
Due to the wide functional capabilities, TAU-4.IP and TAU-8.IP are used as an office PBX that provides internal and external routing, as well as a basic set of supplementary services.

High-Quality Sound
A high-performance hardware platform provides high quality of voice data due to support for a standard set of audio codecs used in VoIP networks (G.711, G.723.1, G.726, G.729), voice features (echo cancellation, silence detector, comfort noise generator, DTMF dialing) and traffic prioritization rules (QoS).

The devices support automatic switching to a redundant 3G/4G channel in case of failure of the main Internet connection. If there are no redundant channels, local routing between voice ports is available.

Centralized configuration downloading, intellectual firmware update and collection of data on subscriber gateway status can be realized through Eltex.ACS system via TR-069. Eltex.ACS provides simplicity of Eltex CPE management and reduces operating expenses.

Modules and additional devices
Documents and files
  • 8 FXS ports 
  • 1 WAN 10/100Base-T
  • 1 USB port
VoIP protocols
  • SIP
Voice codecs
  • G.711 (a-law, µ-law)
  • G.723.1
  • G.726 (24 Kbps and 32 Kbps)
  • G.729 (a/b)
  • T.38 UDP Real-Time Fax
  • G.711 (a-law, µ-law) pass-through
Voice standards
  • VAD (Voice Activity Detector)
  • CNG (Comfort Noise Generation)
  • AEC (Acoustic Echo Cancellation, G.168 recommendation)
Functional features
  • Payphones connection (polarity reversal, meter impulses 12/16 KHz)
  • Subscriber line`s physical parameters measurement 
  • Internal switching is saved in case of a SIP-server connection failure
  • VAS management via a phone
  • Distinctive Ring
  • Keep-alive during operation behind NAT
  • Calling Party Control (CPC)
  • Detection and generation of signals
  • Transmission by INBAND, RFC 2833, SIP INFO methods
Value Added services
  • Call Hold
  • Call Transfer
  • Call Waiting
  • Calls forwarding when busy
  • Calls forwarding on no reply
  • Calls forwarding unconditional
  • Number identification (FSK Type I, FSK Type II, DTMF)
  • Calling Line Identification Restriction (CLIR)
  • Hotline/Warmline
  • Call Group
  • 3-Way Conference
  • Pickup Group
  • Hunt group
  • 3-Way Conference gathered on a server (RFC 4579)
  • Pickup Group
  • Hunt groups
  • A dedicated server for 3-Way Conferencing (RFC-4579) 
VoIP functions
  • Internal connection switching
  • Operation without a SIP server
  • Flexible dial plan
  • Management profiles for FXS ports
  • SIP profiles (support for up to 8 profiles)
  • Geographical redundancy of a SIP server (up to 4 redundant SIP servers)
  • Application of settings without reboot
  • Voice transmission through a protected channel (encryption through IPsec)
  • IMS (3GPP TS 24.623) for Call Hold, Call Waiting, 3-Way Conference, Hotline management
  • Using SIP servers from DHCP option 120
  • Support for operation behind NAT (STUN and Public IP)
  • Setting custom call-control signals
Quality of service (QoS)
  • DSCP and 802.1p assignment for SIP and RTP packets
  • Bandwidth redundancy
Network functions  
  • Different protocols for connection to a service provider network (Static, DHCP, PPPoE, PPTP, L2TP)
  • Local DNS server
  • Dynamic/static routing
  • VLAN per service (VLAN for each service: Internet, VoIP, Management)
  • Firewall
  • Operation via 3G/4G USB modems
  • Print server
  • IPsec (for voice transmission and remote control)
  • WEB (multilingual*)
  • SNMP (phone parameters configuration, monitoring and statistics gathering) 
  • Telnet
  • Syslog
  • Tcpdump
  • SSH
  • TR-069 (Eltex.ACS server is recommended)
  • DHCP-based autoprovision (43, 66, 67 DHCP options)
  • Management via IPsec encrypted channel 
  • Username and password authentication 
  • Firewall
  • Access rights differentiation for admin/user
  • Password encryption
  • Digest authentication
USB port
  • USB-storage connection with FAT/FAT32/EXT2/EXT3/NTFS file systems – files exchange via a network according to FTP protocol
  • USB 3G/4G modem connection –  3G/4G channels reservation
  • Printer connection – setting up of a print server
Technical characteristics
  • SDRAM 256 MB
  • Flash 32 MB
  • OS Linux
Physical characteristics 
  • Power adapter: 12 VDC, 2A
  • Power consumption: up to 16 W
  • Temperature: +5°С to +40°С
  • Humidity: up to 80%
  • Dimensions: 218х120х49 mm, desktop case
  • Weight: no more than 0.3 kg
  • RFC 3261 SIP 2.0
  • RFC 3262 SIP PRACK
  • RFC 4566 Session Description Protocol (SDP)
  • RFC 3263 Locating SIP servers for DNS lookup SRV and A records
  • RFC 3264 SDP Offer/Answer Model
  • RFC 3311 SIP Update
  • RFC 3515 SIP REFER
  • RFC 3891 SIP Replaces Header
  • RFC 3892 SIP Referred-By Mechanism
  • RFC 4028 SIP Session Timer
  • RFC 2976 SIP INFO Method
  • RFC 2833 RTP Payload for DTMF Digits, Flash event
  • RFC 3108 Attributes ecan and silenceSupp in SDP
  • RFC 4579 SIP Call Control - Conferencing for User Agents
  • RFC 3361 DHCP Option 120
  • RFC 3550 RTP A Transport Protocol for Real-Time Applications

* Supported by firmware version 1.2.1 and higher

Related software

ACS_CPE-256 option of Eltex.ACS system for Eltex CPE auto configuration: 256 subscribers

ACS_CPE-512 option of Eltex.ACS system for Eltex CPE auto configuration: 512 subscribers

Опция ACS_CPE-512 системы Eltex.ACS для автоконфигурирования Eltex CPE: 512 абонентских устройств

ACS_CPE-1024 option of Eltex.ACS system for Eltex CPE auto configuration: 1024 subscribers

Опция ACS_CPE-1024 системы Eltex.ACS для автоконфигурирования Eltex CPE: 1024 абонентских устройств

Operational lifetime of the ELTEX equipment
In development
Mass production
Mass production is over
Sold out
Support is over
Regardless of the operational lifetime stage, Eltex provides a 12 months warranty on all its telecommunication equipment.
During the warranty period the manufacturer ensures technical support and free-of-charge repair at the Enterprise which is situated in Novosibirsk.
As part of the warranty service, technical support is provided on the first-in first-out principle.
The priority support packages of 8/5 and 27/7 types are subjects to additional charges.

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