V6100 and V7122 User Guide 255The ‘servername’ string is defined according to the following rules: The ‘servername’ is equal to ‘RegistrarName’ if configured. The ‘RegistrarName’ can beany string. 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’ canbe any string. Otherwise the ‘servername’ is equal to ‘ProxyIP’ (either FQDN or numerical IP address).The parameter ‘GWRegistrationName’ can be any string. If the parameter is not defined, theparameter ‘UserName’ is used instead.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.REGISTER messages are sent to the Registrar’s IP address (if configured) or to the Proxy’sIP address. A single message is sent once per gateway, or messages are sent per B-channel according to the parameter ‘AuthenticationMode’. The registration request is resentaccording to the parameter ‘RegistrartionTimeDivider’. For example, if‘RegistrationTimeDivider = 70’ (%) and Registration Expires time = 3600, the gatewayresends its registration request after 3600 x 70% = 2520 sec. The default value of‘RegistrartionTimeDivider’ is 50%.If registration per B-channel is selected, on gateway startup, the gateway sends REGISTERrequests according to the maximum number of allowed SIP dialogs (configured by theparameter NumberOfActiveDialogs). After each received response, the subsequentREGISTER request is sent.SIP Call Flow ExampleThe Call Flow, shown in Figure 87, describes SIP messages exchanged between V7122gateway and an MP-108 gateway during a simple call.MP-108 (10.8.201.108) with phone number ‘8000’, calls IPmedia 2000 (10.8.201.10) withphone number ‘1000’:
