[SIPForum-discussion] Need help about RFC 3262
古明路
ggmylove at hotmail.com
Wed Jul 11 08:19:22 UTC 2007
Hi
I know what 'reliable response' means,
I only want to know that,
the 'reliable responses' there(in 3262),
have SDP or not.
For example, the UAS have sent a reliable 183(with SDP),
but not received PRACK yet, at that time,
if it wanted to send 200(INVITE), it's OK ?
If 183 had not SDP, it's OK ?
Date: Wed, 11 Jul 2007 16:46:28 +0900From: j.koshiko at east.ntt.co.jpTo: ggmylove at hotmail.comSubject: Re: [SIPForum-discussion] Need help about RFC 3262CC: discussion at sipforum.org
"Reliable response" means a response which include Require header with 100rel.
UAS can put "Require: 100rel" to provisional responses in order to ask UAC
to send PRACK for the provisional response.
Session description is independent of whether a response is reliable or not.
Reliable responses may or may not include SDP.
Hope this help.
> Hi,All
>
> At the end of '3 UAS Behavior' RFC 3262,
>
> The UAS MAY send a final response to the initial request before
> having received PRACKs for all unacknowledged reliable provisional
> responses, unless the final response is 2xx and any of the
> unacknowledged reliable provisional responses contained a session
> description. In that case, it MUST NOT send a final response until
> those provisional responses are acknowledged. If the UAS does send a
> final response when reliable responses are still unacknowledged, it
> SHOULD NOT continue to retransmit the unacknowledged reliable
> provisional responses, but it MUST be prepared to process PRACK
> requests for those outstanding responses.
>
> Can some one tell me, the red words 'reliable responses ' mean 'provisional responses contained a session description' or 'provisional responses without a session description'.
>
> thanks & regards,
> Minglu
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