[SIPForum-discussion] SIP INFO method and mid-session

KwangHee Choi theidea at lguplus.co.kr
Fri Oct 5 01:00:44 UTC 2012

Hi all,


I want to discuss about  SIP INFO method.

According to the rfc 2976, 

The INFO method is used for communicating mid-session signaling

    information along the signaling path for the call.


When is the mid-session point?  receiving 18x, 200 or sending ACK?


Is it reasonable the following call flow?




   ===>           INVITE



   183              <===



INFO              <===



In my opinion, Proxy will discard INFO method. Because the mid-call is not
established between UA and GW


How about you?




KwangHee Choi


Principle Research Engineer / Ph.D.

Communication Service Development Team


34, Gajeong-Dong, Yuseong-Gu, Daejeon, Korea 305-350

e-mail   : theidea at lguplus.co.kr

tel        : +82-42-712-4206

mobile   : +82-10-8080-8202

fax       : +82-50-5889-4206



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