Sip Call Flow Example - 3Com V7122 User Manual

The 'servername' string is defined according to the following rules:
The 'servername' is equal to 'RegistrarName' if configured. The 'RegistrarName' can be
any string.
Otherwise, the 'servername' is equal to 'RegistrarIP' (either FQDN or numerical IP
address), if configured.
Otherwise the 'servername' is equal to 'ProxyName' if configured. The 'ProxyName' can
be 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, the
parameter 'UserName' is used instead.
The 'sipgatewayname' parameter (defined in the ini file or set from the Web browser), can be
any 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's
IP 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 resent
according to the parameter 'RegistrartionTimeDivider'. For example, if
'RegistrationTimeDivider = 70' (%) and Registration Expires time = 3600, the gateway
resends 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 REGISTER
requests according to the maximum number of allowed SIP dialogs (configured by the
parameter NumberOfActiveDialogs). After each received response, the subsequent
REGISTER request is sent.

SIP Call Flow Example

The SIP call flow, shown in
V7122 gateway and an MP-108 gateway during a simple call. MP-108 (10.8.201.108) with
phone number '8000', calls V7122 gateway (10.8.201.10) with phone number '1000':
V7122 Gateway User Guide
Figure 80, describes SIP messages exchanged between a
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