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BIG 55 - Business Voice Gateway

The convergence of existing network structures to a standardized Next Generation Network (NGN) is steadily proceeding because it offers long-term cost benefits. In the future only one single telecommunications network needs to be operated and supported for the transmission of data, voice and multimedia services.

In addition, the maintenance of the TDM backbone networks is becoming more expensive due to partially outdated hardware or discontinued components. To ensure a smooth migration process in the coming years, not only residential customers must be integrated into the NGN structure, but also a variety of business customers with their individual ISDN phones and PBXs.

Up to 4 S0 interfaces enable the migration of max. 8 ISDN terminating devices into the NGN. BIG 55 supports both, ISDN phones in P2MP mode (optional), as well as ISDN PBX systems in P2P mode. Connected ISDN PBXs can be synchronized via the integrated clock output (T4) resp. the S0 interfaces which are synchronized to the central clock.

  • With concurrent transcoding of up to eight compressed calls (e.g. G.729) one of the most powerful Business Voice gateways
  • CPE synchronisation options (via T3, T4); High CPE clocking accuracy by use of 4.8 ppm hardware clock
  • Increase the number of S0 interfaces by cascading two BIG 55 Gateways. Support of ISDN PABX and stable fax transmission by using T.38 and G.711

WAN interface

  • Ethernet-WAN (electrical): 10/100/1000 Base-T

LAN interfaces

  • Ethernet LAN: 3 × 10/100/1000 Base-T; RJ45; Auto MDI/MDIX
  • DHCP or static IP
  • Mirror port for simplified troubleshooting

Quality of Service & Security

  • Quality of Service: DSCP for SIP & RTP
  • SIP Digest Authentication


  • CLI via Telnet/SSH
  • Remote Management via SNMP v1, v2, v3
  • Firmware update: Remote and local Firmware update
  • TR-069 – CPE WAN Management Protocol
  • TR-104 – Provisioning Parameters for VoIP
  • TR-181 – Device Data Model for TR-069

Voice interfaces

  • 2 × ISDN S0 (only BIG 5542)
  • 4 × ISDN S0 (only BIG 5530/5540/5544)
  • 2 × TAE/FXS (only BIG 5540)
  • 2 × RJ11/FXS (only BIG 5542/5544)

ISDN S0 interfaces

  • acc. to ETS 300 012 guideline
  • 4 × NT-Mode
  • Point-to-Point or Point-to-Multipoint
  • Power supply: up to 2 W (for all S0)
  • Connector type: RJ45
  • 100 ? Bus termination resistors integrated

Voice support

  • Support of DDI and MSN
  • Signalling: SIP, SIP Trunking (RFC 3261/2 etc.)
  • Speech codecs: G.711, G.726, G.729, G.722 etc.
  • Voice comfort via VAD, CNG

Supplementary services

  • Fax: G.711 pass through; T.38; 64 kbps unrestricted B-channels

Data Sheet BIG 55
Business Voice Gateway