Hello,
Pekka Pessi wrote on 22 Feb 2006:
> Nua goes through the list of contacts in response to REGISTER,
> if it founds a URI that matches with a URI in original REGISTER
> request it calculates the expiration time of contact with
> sip_contact_expires().
I am using Sofia-SIP v1.12.10 to interoperate with a SIP trunk.
When I send REGISTER to the ITSP SBC serving as outbound proxy, the SBC itself
typically responds with 200 OK and no authentication challenge. The 200 OK
includes a replica of the Contact header from the original REGISTER, and
Sofia-SIP is able to match the URI and the 'expires' parameter takes effect.
Sofia-SIP automatically re-registers periodically.
Occasionally, the SBC responds with an authentication challenge on behalf of
the SIP server behind the SBC. The authentication information is accepted and
the SBC responds with 200 OK, but the URI in the Contact header in that 200 OK
response has been changed from a replica in the original INVITE to the URI of
the SBC itself.
This change to the URI appears to prevent Sofia-SIP from correlating the
response with the REGISTER, and the 'expires' parameter does not take effect.
Instead, some other much longer fallback timeout in Sofia-SIP must expire
before the next re-registration is automatically sent.
Does this sound plausible?
Is the SBC doing the wrong thing by changing the Contact header, or is that
expected and there is something else I just don't know?
Assuming the SBC is doing the wrong thing, but correcting that is beyond my
control, is there an API function in Sofia-SIP that I can call to force set the
re-registration timer on the fly, after I correlate the response myself?
Short of that, the only thing I can think of is to release the registration
context and start a new registration. But that seems like a kludge.
Any suggestions are most welcome.
Thanks.
Jim
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