VoIP Gateway TAU-32M.IP

Key features
  • Office PBX functionality
  • High-quality sound
  • Current and voltage port protection
  • Measurement of subscriber line physical parameters
  • The maximum length of line – 6 km

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Physical parameters
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Multiport Access VoIP-gateways TAU series are designed and suitable for voice and facsimile information transmission via the IP-network. Gateways provide customers with high-quality Telephone Communications with Value Added Services Support: call-forward, call waiting, 3-way conference, pick up, group call, call line identification presentation etc.

High quality Voice
The high quality of sound is ensured by the use of the high-performance hardware, support for main audio codecs used in VoIP networks (G.711, G.723.1, G.726, G.729), echo cancellation function, use of silence detector, comfort noise generation, DTMF signals reception and generation and prioritization mechanisms (QoS).

In case of the loss of main SIP server connection, TAU switches to the redundant SIP server automatically with monitoring of service capability of the main one. If there is a connection loss with both servers, local switching among gateway subscribers is saved.

A friendly multilingual management interface and support for group management means based on TR-069 and DHCP (DHCP autoprovisioning) enable easy exploitation of unlimited number of TAU on an operator’s network.

Eltex.EMS management system
For gateways mass exploitation on network Eltex offers unified monitoring and control system Eltex.EMS. The system provides gateways group centralized management with the ability of ports monitoring via unified web-interface.


  • FXS ports - up to 32
  • FXO ports - up to 32
  • Type of connector - CENTRONICS-36
  • Ethernet 10/100/1000BASE-T ports (RJ-45) - 3

VoIP protocols
  • SIP
  • SIP-T
  • H.323

Voice codecs
  • G.729 (A, B)
  • G.711 (a-law, µ-law)
  • G.723.1 (6.3/5.3 Kbps)
  • G.726 (32 Kbps)

  • 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 (echo cancellation in accordance with ITU-T G.168)
  • AGC (automatic gain control)
  • PLC (packet loss concealment)

  • SIP server authentication with common username and password for all subscribers
  • SIP server authentication with individual username and password for each subscriber
  • Support for redundant SIP servers
  • Support for Outbound SIP servers from DHCP Option 120
  • Direct routing to the unregistered devices on a SIP server
  • Internal switching is saved in case of SIP server connection loss
  • Locally Supplementary Services’ processing (distributed mini PBX mode)
  • Regular expressions in Dialplan
  • Caller and called numbers modifications
  • Distinctive ring service
  • User tone signals
  • Limitation of simultaneous connections
  • CPC (Calling Party Control): disconnect signal by circuit disruption
  • Support for pay phone
  • Support for operation behind NAT (STUN, PublicIP)
  • Signal generation when a handset is off-hooked
  • Supplementary Services management via phone added codes
  • Applying of settings without reboot
  • Forming of DHCP Option 82, Agent client circuit ID, Agent remote ID suboptions

Quality of service (QoS)
  • 4 priority queues
  • Packet distribution to queues based on 802.1p and/or DSCP
  • Assigning of DSCP and 802.1р priorities for SIP and RTP packets

Value Added Services
  • Caller line identity presentation (CLIP)
  • Issuing of a caller name and time of a call in FSK mode
  • Calling line identification restriction (CLIR)
  • Call Transfer
  • Call Pickup
  • 3-Way Conference
  • Hotline/Warmline
  • Call Waiting
  • Call Forward (CFU, CFB, CFNR, CFOOS)
  • Call Group
  • Call Hold
  • Music on Hold (MOH)
  • Message-waiting indicator (MWI)
  • Do not Disturb (DND)
  • IMS (3GPP TS 24.623) for Call Hold, Call Waiting, 3-Way Conference, Hotline, Call Transfer

Network functions
  • 802.1Q
  • Possibility to use different VLAN for signalling, RTP and management
  • SNTP
  • Local and external DNS
  • STP
  • LLDP
  • Dual homing redundancy
  • IPSec
  • Firewall

Types of connections
  • Static IP address
  • DHCP client
  • PPPoE client
  • РРТР client

Remote monitoring
  • SNMP
  • TR-069

  • Auto update of the firmware and configuration (DHCP options 43, 66 and 67)
  • Command line interface (CLI) via Telnet, SSH, Console port RS-232
  • Parameters configuring via SNMP (Eltex.EMS management system)
  • WEB interface in Russian language
  • Parameters configuring via TR-069

  • Syslog
  • Subscriber lines parameters testing
  • Checking for a phone available on the line

  • Detailed statistics per port
  • Call history

  • Username and password control
  • Access rights differentiation: admin/user
  • Configuration file encryption
  • Access to WEB via RADIUS authentication
  • Access to WEB only via HTTPS

Physical parameters

Power supply
  • 220 V AC or 48/60 V DC
Power consumption at 0.2 Erl
  • ≤ 40 W
Power consumption at 1 Erl
  • ≤ 50 W
Dimensions (W×H×D), mm
  • 430×45×191
Operating temperature
  • from 0 to +40 °С
  • 3.2 kg
Form factor
  • 19", 1U
Operating humidity
  • ≤ 80 %

Documents and files


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.