3Com® VCX V7111 VoIP Gateway User Guide 271Proxy or Registrar Registration ExampleThe REGISTER message is sent to the Registrars IP address (if configured) or to theProxy’s IP address. The message is sent per gateway or per gateway endpoint according tothe AuthenticationMode parameter. Usually the FXS gateways are registered per gatewayport, while FXO gateways send a single registration message, where Username is usedinstead of phone number in From/To headers. The registration request is resent according tothe parameter RegistrartionTimeDivider. For example, if RegistrationTimeDivider = 70 (%)and Registration Expires time = 3600, the gateway resends its registration request after 3600x 70% = 2520 sec. The default value of RegistrartionTimeDivider is 50%.REGISTER sip:servername 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: sip:101@212.179.22.229Content-Length: 0The servername string is defined according to the following rules: The servername is equal to RegistrarName if configured. The RegistrarName can be anystring. Otherwise, the servername is equal to RegistrarIP (either FQDN or numerical IPaddress), if configured. Otherwise the servername is equal to ProxyName if configured. The ProxyName can beany string. Otherwise the servername is equal to ProxyIP (either FQDN or numerical IP address).The sipgatewayname parameter (defined in the ini file or set from the Web browser), can beany string. Some Proxy servers require that the sipgatewayname (in REGISTER messages)is set equal to the Registrar/Proxy IP address or to the Registrar/Proxy domain name.Configuration ExamplesEstablishing a Call between Two GatewaysAfter you have installed and set up the V7111 gateway, you can ensure that it functions asexpected by establishing a call between it and another gateway. This section exemplifieshow to configure two 8-port V7111 FXS SIP gateways to establish a call. After configuration,you can make calls between telephones connected to a single V7111 gateway or betweenthe two V7111 gateways.
