RE: [Sip-implementors] Query on tags in From field and Retransmission of INVITE responses in TCP !!

[Brett Tate]

> I have question on the RFC related to the 
> "From" field. In the "From" field there is 
> a requirement to define a "tag" parameter 
> (MUST). I am unable to create a scenario 
> wherein this would be required from the 
> UAC perspective. 

The requirement helps to distinguish a re-invite 
from invite when sent in the reverse direction.

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