3Com VCX V7111 VoIP SIP Gateways User Manual 49C HAPTER 5: P ROFILING AND OPERATIONAll VCX V7111 Gateways have similar functionality except for the number ofchannels (the VCX V7111 24 FXS and 2FXS support only FXS), and all versionsare referred to collectively in this document as the VCX V7111.VCX V7111 FXS refers only to the 24FXS, 8FXS, 4FXS, and 2FXS Gateways.VCX V7111 FXO refers only to 8FXO and 4FXO Gateways.SIP ProfileSupported SIP FeaturesThe VCX V7111 complies with RFC 3261 IETF standard.The VCX V7111/SIP main features are: Works with or without a proxy. When no proxy is specified an internal routing table isused instead. Fallback to internal routing table if communication with the proxy server fails. Supports two redundant proxy servers. If main proxy fails, the VCX V7111 automaticallyswitches to the first redundant proxy. Proxy and Registrar Authentication (handling 401 and 407 responses) using either Basicor Digest (MD5) methods. Proxy Registration, such as:REGISTER sip:proxyname SIP/2.0VIA: SIP/2.0/UDP 212.179.22.229;branch=z9hG4bRaC7AU234From: ;tag=1c29347To: Call-ID: 10453@212.179.22.229Seq: 1 REGISTERExpires: 3600Contact: ;expires=3600Content-Length: 0Where the proxyname and sipgatewayname strings are defined in the VCX V7111 INI file(or configured from the web).By default the REGISTER request will be sent to the proxy IP address. It is possible tochange the registration address by configuring the REGISTRAR IP address.
