[SIPForum-discussion] 180 Ringing with SDP
Raghul Prasanna
raghul82 at yahoo.co.uk
Thu Aug 7 10:28:51 UTC 2008
Hi,
Say if user 1 is registered to Machine 1 and User 2 is registered to Machine 2 and Machine 3. I call User 2 from User 1.
In wireshark trace I see 180 Ringing with SDP and both the machines to which User 2 is registered rings. But I think we shouldnt be getting 180 with SDP because say if we get 180 Ringing with SDP from Machine 2 and the User Picks the phone on Machine 3 which has different Media settings, the 200 OK will have different SDP and 180 will have different SDP.
Or shd it be following what RFC 3261 says
"If more than one Contact is sent in a REGISTER request, the
registering UA intends to associate all of the URIs in these Contact
header field values with the address-of-record present in the To
field. This list can be prioritized with the "q" parameter in the
Contact header field. The "q" parameter indicates a relative
preference for the particular Contact header field value compared to
other bindings for this address-of-record. Section 16.6 describes
how a proxy server uses this preference indication."
So in this case if the User with higher preference doesnt answer, will the proxy will try calling the user with next preference and in this case send a new invite to the other user?
Thanks,
Raghul
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