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BIG 5540

ISDN VoIP gateway

with 4 ISDN S0 and 2 TAE (FXS) ports




The BIG 5540 ISDN VoIP gateway links ISDN equipment, e.g. ISDN PBX, and analogue telephones to the IP world offering cost-effective communication with a superior quality of service. 4 ISDN S0 ports are available to connect ISDN voice and data equipment to the IP network. Additionally, 2 TAE (FXS) ports can be used to plug in analogue equipment. With up to 8 simultaneous connections the BIG 5540 provides a powerful solution for small businesses and call centres. By cascading two BIG 5540 gateways the number of ISDN S0 ports, TAE ports and VoIP channels can be doubled. The BIG 5540 supports legacy services, managed IP services and IP Centrex applications.

  • 4 ISDN S0 ports
  • 2 analogue TAE (FXS) ports
  • Up to 8 ISDN access sockets
  • Up to 8 simultaneous conncetions
  • Point-to-Multipoint mode for ISDN phones
  • Point-to-Point mode for ISDN PBX systems
  • T3/T4 clocking port for synchronisation of cascaded BIG 5540
  • Support of legacy and managed IP services
  • Support of IP Centrex applications
  • Gigabit Ethernet WAN port
  • 3 Gigabit Ethernet LAN ports
  • Management: CLI via Telnet/SSH, SNMPv3, TR-069
  • Signalling: SIP, SIP Trunking
  • Audio codecs: G.711, G.726, G.729, G722 etc.
  • Fax over IP (T.38, G.711)


Basic voice communications with simultaneous connections, including data and fax

Migration of ISDN PBX to IP network – maintain existing PBX infrastructure and dialing habits

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