Hi,
Sorry to bother you.
Following the questing below, I have one more question..
Our B2BUA received provisional responses sequentially (one is reliable,
another is unreliable).
And we received unreliable 183 before acknowledgement of the first reliable
message.
In this case, should we relay the PRACK for the first reliable 183??
UAC B2BUA UAS
1) INVITE ->
INVITE -> (supported :100rel)
2) <- 183 (with SDP, required:100rel)
<- 183(with SDP, required:100rel)
3) <- 183 (unreliable, no SDP)
<- 183(unreliable, no SDP)
4) PRACK ->
PRACK -> (should we relay this PRACK for the first reliable 183?)
Thanks in Advance,
Regards,
Wsjung
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[Sip-implementors] Query on unreliable provisional Response
Worley, Dale R (Dale) dworley at avaya.com
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Thu Feb 24 11:45:48 EST 2011
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Hi all,
Is it OK to send unreliable provisional response, while waiting for
PRACK for a already sent provisional response?? According to RFC 3262, it has
been explicitly
mentioned that reliable provisional response should not be sent, while
waiting for PRACK for a already sent provisional response.
Please clarify.
Thanks,
kumar
Extract from RFC:
After the first reliable provisional response for a request has been
acknowledged, the UAS MAY send additional reliable provisional
responses. The UAS MUST NOT send a second reliable provisional
response until the first is acknowledged.
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