Hi All,
Following is the excerpt from the RFCs 3261 and 6337, with respect to
Answer being carried in Reliable-1xx and 2xx-INV
<3261>
o If the initial offer is in an INVITE, the answer *MUST *be in a
reliable non-failure message from UAS back to UAC which is
correlated to that INVITE. For this specification, that is
only the final 2xx response to that INVITE. That same exact
answer MAY also be placed in any provisional responses sent
prior to the answer. The UAC MUST treat the first session
description it receives as the answer, and MUST ignore any
session descriptions in subsequent responses to the initial
INVITE.
</3261>
<6337>
In Pattern 3, the first reliable provisional response *may or may not*
have an answer. When a reliable provisional response contains a
session description, and is the first to do so, then that session
description is the answer to the offer in the INVITE request. The
answer cannot be updated, and a new offer cannot be sent in a
subsequent reliable response for the same INVITE transaction.
</6337>
Looks like rfc6337 is little bit deviating from 3261's intention.
rfc6337 - may or may not requirement for carrying answer in reliable 1xx
rfc3261 - MUST requirement for carrying answer in 2xx/reliable
non-failure response
Am I missing something here ????
Thanks,
Nataraju A.B.
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