VoIP Gateways TAU-4.IP

  • Office PBX functionality
  • 3G/4G channel reservation
  • IPsec encryption
  • TR-069/DHCP-based autoprovision
  • Maximum line length—6 km
  • Measurement of subscriber's line parameters
TAU-4.IP VoIP gateway is an optimal solutions that can be used to provide advanced VoIP services to corporate clients via analogue phone devices. 

Business solution
High-end functionality and seamless operation at maximum load allows TAU-4.IP to be used as a separate, independent mini PBX with internal commutation and basic set of VAS. Support of advanced standards ensures seamless integration with independent IP-PBX solutions.

High-Quality Sound
A high-performance hardware platform based on an advanced chip by Mindspeed Technologies supports  all popular audio codecs used in VoIP networks (G.711, G.723.1, G.726, G.729). Echo cancellation, silence detector, comfort noise generator, DTMF signals receipt and generation and traffic prioritization (QoS) ensure the high quality of the voice data. 

In case of the main connection to the Internet loss, there is a possibility of automatic switching to a backup 3G/4G channel. If there is no backup channel, the connection between gateway subscribers is saved.

The opportunity of centralized configuration downloading, intellectual firmware update and collection of data about subscriber gateway states is realized in Eltex.ACS via TR-069 protocol. The system provides simplicity of Eltex CPE management and reduces operating expenses.
  • 4 x FXS ports 
  • 1 x WAN 10/100 Base-T
  • 1 x 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, tariff impulses 12/16 KHz)
  • Measurements of customer line physical parameters 
  • Internal connection switching in case of connection loss with SIP-server
  • VAS management from telephone
  • Distinctive Ring
  • Keep alive in case of working behind NAT
  • Detection and generation of DTMF signals
  • Transmission by INBAND, RFC 2833, SIP INFO methods

Value Added services
  • Call Hold
  • Call Transfer
  • Call Waiting
  • Calls forwarding when busy
  • Calls forwarding when no reply
  • Calls forwarding unconditional
  • Number identification (FSK Type I, FSK Type II, DTMF)
  • Calling Line Identification Restriction of Caller ID 
  • Hotline/Warmline
  • Call Group
  • 3-Way Conference
  • Pickup Group
  • Group of Serial search
  • 3-Way Conference, gathered on a server (RFC 4579) 
VoIP functions
  • Internal connection switching
  • Work without SIP-server
  • Flexible numeration plan
  • 3G/4G reservation
  • Setting profiles for FXS-ports
  • SIP profiles (up to 8 profiles)
  • Geographical reservation of SIP-server (up to 4 backup SIP-servers)
  • Settings appliance without reboot
  • Voice transmission through a protected channel (encryption by IPsec)
  • IMS (3GPP TS 24.623) for Call Hold, Call Waiting, 3-Way Conference, Hotline management
  • SIP-server appliance from DHCP-option 120
  • Work behind NAT (STUN и Public IP)
  • Self call-control signal settings
Quality of service (QoS)
  • DSCP and 802.1p assignment for SIP and RTP packets
  • Bandwidth reservation
Network functions  
  • Different protocols for connection to 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
  • Work 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
  • SSH
  • TR-069 (working with Eltex.ACS server is recommended)
  • DHCP-based autoprovision (43, 66, 67 DHCP-options)
  • Management via IPsec encrypted channel 
  • Login and password authentication 
  • Firewall
  • Distinction of access rights for admin/user
  • USB-storage connection to file systems FAT/FAT32/EXT2/EXT3/NTFS – files exchange in networkaccording to FTP protocol
  • USB 3G/4G modem connection –  3G/4G channel reservation
  • Printer connection – print server setting

Current firmware version 2.2.0