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33
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 re-INVITE to
Session Refresher: It is the gateway's role in Session Timer. UAS is an originator, and UAC
is a replier.
Enable P-Assert: It is for caller id protect.
Privacy Type: Privacy requested for Third-Party Asserted.
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.
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