Hi all, 

RFC4317 "SDP Offer/Answer Examples" provides many useful exapmles 
of the sdp exchages for the offer-answer model, but there may be an 
inconsistency on the usage of the session-version incrementation 
in the second answer.

In the examples in section 2.5, 5.2, and 5.3, in which there are 
no changes in the second answer, the session-version number of 
the o-line in the second answer is not changed from the number 
in the first o-line sent by Alice or Bob who comes to be the sender 
of the second answer. 
However, in section 3.2, the version number in the o-line 
is incremented (from 2890844526 to 2890844527.)

Should the sess-version number in the second answer 
be unchanged in the case of section 3.2, as it is in the cases 
of section 2.5, 5.2, and 5.3, so far as the content of the 
second answer is identical to the previous one? 

As far as the instructions provided by RFC3264, there seems to be 
no guidelines whether the sess-version in the second answer should 
be incremented from the previous one in just the case described above.

Any assistance or advice you could give on the subject would be 
greatly appreciated.

Best regards,
Hiroshi

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