Hi All,

As per RFC3262:Section 4 UAC Behavior:

Contact header presence in SIP responses has been defined as following:

               Contact                 R       -
               Contact                1xx      -
               Contact                2xx      -
               Contact                3xx      o
               Contact                485      o



​As per above table snippets , can any one help me to find  in which real
time scenario, on behalf of PRACK, UAS generates 1XX,3XX and 485 responses.




-- 
Regards
Ajit Singh
GlobalLogic

​
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