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

[Abhisek Acharya]

Mid-session means in the middle of the session.SO It should be after RTP
path gets established.INFO should go after ACK from either of the party.Why
some user agent is sending INFO anyways before session is established.

Regards
Abhisek Acharya

On Fri, Oct 5, 2012 at 6:30 AM, KwangHee Choi <theidea at lguplus.co.kr> wrote:

>  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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