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

[KwangHee Choi]

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?

 

UA------------Proxy-------------GW

   INVITE

   ===>           INVITE

                     ===>

                     183

   183              <===

  <===

                     INFO

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

LG U+

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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