Hello everyone,

I would like to know about the behaviour of a UAC when it receives 180 response 
like this:

UAC --INVITE -------------> UAS
      Supported: 100rel 

UAC <---- 180 Ringing ----- UAS
          Rseq: 1

Please note that there is no Required: 100rel in 180. As I understand, when 
there is no Required: 100rel, the Rseq header can be ignored.

Please Correct me if I am wrong.

Thanks & Regards,
Babu
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