Hi Andreas,
Offer can not be in the non-reliable provisional responses. But Answer can be in the non-reliable provisional responses.
In theory, any SIP message can include session description in its
body. But not all the session description in a SIP message is an
offer or an answer. Only the session description that conforms to the
rules described in the standard track RFCs can be interpreted as an
offer or an answer. The rules how to handle offer/answer model are
currently defined in several RFCs. Unless defined in an RFC
explicitly as an offer or an answer, except ones in non-reliable
provisional response to INVITE request, a session description should
not be included in SIP messages to avoid confusions.
Please refer the following Draft for more information
http://tools.ietf.org/wg/sip/draft-sawada-sipping-sip-offeranswer-00.txt
Regards,
Thangarajan.
FlextronicsSoftware
Worlds largest SIP stack vendor
Andreas Byström <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 02/03/2006 07:59 AM |
|
This is exaclyt what I'm looking for but cant find in the specifications
(the part that SIP mandates offer/answer in reliable responses). Could you
please assist me in finding where (and in what) rfc I can find this?
Regards,
// Andreas
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]] On Behalf
> Of [EMAIL PROTECTED]
> Sent: Thursday, February 02, 2006 3:31 PM
> To: [email protected]
> Subject: Re: [Sip-implementors] Offer/answer retransmission OK?
>
>
>
>
> You cannot Send SDP(answer) in a response that is not
> reliable, for the simple reason you don't get the
> Acknowledgement whether the offerer has received it or not.
> The offer/answer model in SIP mandates that the answer be
> received reliably. This is taken care by using reliable
> provisional response or by sending ACK to 2XX response.
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:sip-implementors-> [EMAIL PROTECTED] On Behalf
> Of Andreas Byström
> Sent:
> Thursday, February 02, 2006 6:02 PM
> To: [email protected]
> Subject: [Sip-implementors] Offer/answer retransmission OK?
>
> Hi I have two SDP questions:
>
> 1. Is it (according to RFCs) ok to send the SDP answer in a
> SIP response that is not reliable? I.e, is it ok to send SDP
> in 180 (that is not using
> PRACK)
> 2. If sent in 180 (as above) is it then ok to send the exact
> same response again in 200 OK? Is it allowed to respond to a
> offer in two different mesages (first 180 and then 200). Does
> it matter if 180 is reliable (say that PRACK is used for 180,
> still ok to send SDP answer in 200?)
>
> Regards,
> // Andreas
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