Hi,
One of the PRACK related issues presented in SFO is whether we should change the requirement to include SDP offer in the first reliable provisional response, if the INVITE does not contain SDP.
Two use-cases, which the current requirement affect, were presented:
1. H.323/SIP interworking, where an empty INVITE may have been received and an SDP offer is not available when the first reliable 18x is to be sent (please see meeting slides for details).
2. Call fowarding, when a 181 provisional is sent. The 181 may be sent by an intermediate, and if the INVITE did not contain SDP a reliable 181 would be required to contain an SDP offer.
It was indicated that there may be backward compability issues. That of course depends on the number of deployments where INVITE without SDP is sent AND a reliable 18x without SDP offer would cause an error.
Some people indicated concern, so I would like to ask what people think? Would changing the rules cause problems in existing deploymentnts?
Regards,
Christer
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