Hi All,
Consider call up between UA1 & UA2.
UA1 & UA2 sends reINVITE to each other at the same time which got glared.
UA1 was non dialog owner hence its get chance to send reINVITE first.
UA1 UA2
--------reINVITE--------------->
<-------reINVITE----------------
------------491------------------->
<------------491-------------------
<After 1 sec>
---------reINVITE---------------->
First reINVITE from UA1 to UA2 has SDP "o" line as below:
o=sip:user@10.198.1.8 1 9 IN IP4 10.198.1.8
Thus when UA1 sends reINVITE again after glare which "o" line it should
pick(other headers of SDP are same as previous)?
Case a) o=sip:user@10.198.1.8 1 9 IN IP4 10.198.1.8
Case b) o=sip:user@10.198.1.8 1 10 IN IP4 10.198.1.8
i.e. should UA1 increment SDP session version id from "9" to "10" or keep it as
"9".
If UA1 chooses case(a) then UA2 treats this reINVITE after glare as a session
refresh reINVITE (as sdp session-version is same a previous)
Any RFC text to support this should help.
Thanks,
Puneet
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