SIP
All Call through OutBound Proxy：An outbound proxy server handles SIP call signaling as a
standard SIP proxy server would. Furthermore, it receives and transmits phone conversation traffic (media) in between two talking gateways. This option tells the gateway to send and receive all SIP packets to the destined outbound proxy server rather than the remote gateway. This helps VoIP calls to pass through any NAT protected network without additional settings or techniques. Please make sure your VoIP service provider supports outbound proxy services before enable it.
Session Expiration: It is to avoid the billing of abnormal dropping the call because of Internet. The default is disabled.
Session Refresh Request: to send the packet of UPDATE or
Session Refresher: It is the gateway’s role in Session Timer. UAS is an originator, and UAC is a replier.
Enable
Privacy Type: Privacy requested for
SIP Message Resend Timer Base: SIP packet will resend if response didn't arrive in the base time set in this column. It will send again at "base time" * 2, and send again at "base time" *2 *2. The max of resend time is 4 sec. Resend will stop/restart when total resend 20sec has reached.
Max. Response Time for Invite: If the destination does not reply in the set time, this call is failed.
Invite URL need ‘user=phone’: There is ‘user=phone’ in invite packet.
Reliability of Provisional Responses: Provide information on the progress of the request processing if ticked.
Compact Form: It decreases the size of SIP header if ticked.
