> Also I want to know what should be the answer in this case ? 

Because the offer SDP is malformed, the device can basically act how it wants.  
Similarly, I assume that the behavior might vary based upon if received within 
INVITE, UPDATE, PRACK, 18x, or 2xx.

Some aspects are likely discussed within RFC 6337.

A strict device would likely reject the INVITE or UPDATE (or PRACK depending 
upon RFC 3262 interpretation) with a 400, 488, or 606.

-brett


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