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

[Pranav Damele]

Yobosaeyo! KwangHee,

The SIP INFO method can be used by SIP network elements to transmit DTMF
tones during a established call (mid-session). It is after SIP 200 OK.

In the DTMF relay method the body of the SIP message consists of signaling
information and uses the content-type *application/dtmf-relay*


INFO sip:7007471000 at example.com SIP/2.0
Via: SIP/2.0/UDP alice.uk.example.com:5060
From: <sip:7007471234 at alice.uk.example.com>;tag=d3f423d
To: <sip:7007471000 at example.com>;tag=8942
Call-ID: 312352 at myphone
CSeq: 5 INFO
Content-Length: 24
Content-Type: application/dtmf-relay

Signal=5
Duration=160

*Cheers* ,
Pranav Damele
**

On 5 October 2012 06:30, 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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