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

[Abhisek Acharya]

Even ISUP supports media flow via channels before real call gets statrted.
ACM has a bit which will tell you if there will be any flow of media in the
media channel or not before the call is established....OBCI should contain
inband info true for this kinda implementations.

Regards
Abhisek Acharya

On Thu, Oct 11, 2012 at 3:23 PM, Abinash Sarangi <s_abinash at hotmail.com>wrote:

> Yes you are right..BT IUP supports all these mid call ISUP messages for
> IVR and VM like solutions..After getting Backward CPG or ACM , INF and INR
> are exchanged between local and remote exchanges..
>
> Thanks
> -Abinash
>
>
> ------------------------------
> Date: Tue, 9 Oct 2012 12:00:29 +0100
> From: raghul82 at yahoo.co.uk
>
> Subject: Re: [SIPForum-discussion] SIP INFO method and mid-session
> To: s_abinash at hotmail.com; theidea at lguplus.co.kr; discussion at sipforum.org
>
>
> HI All,
>
> What about the following scenario
>
> SS7 -> Media Gateway -> SIP (using SIP I)
>
>
> SS7 - from BT
>
> BT supports INF and INR messages. Such messages are sent before the call
> gets connected.
>
> When the Media gateway converts the SS7 message into SIP I, it creates SIP
> Info message and encapsulates INF\INR in SIP Info.
>
> Thanks,
> Raghul
>
>   ------------------------------
> *From:* Abinash Sarangi <s_abinash at hotmail.com>
> *To:* KwangHee Choi <theidea at lguplus.co.kr>; "discussion at sipforum.org" <
> discussion at sipforum.org>
> *Sent:* Monday, 8 October 2012, 12:10
> *Subject:* Re: [SIPForum-discussion] SIP INFO method and mid-session
>
> Hi Kwanghee,
>
> If the INFO would have been sent by the UA, it would have been reasonable.
> Lets discuss about a scenario, where the call is getting connected to a IVR
> server or VM server, and UA is getting some early media (183 session in
> progress) where the IVR or VM server wants it to dial a PIN so that the
> call will be subsequently connected to a final destination.
> In this scenario, UA can send INFO(Out of band) to send the digits(DTMF).
> In your scenario, GW is sending INFO, not sure what they want to deliver.
> Is this GW your product or some vendor's.
>
> Thanks
> -Abinash
>
>
> ------------------------------
> From: theidea at lguplus.co.kr
> To: discussion at sipforum.org
> Date: Fri, 5 Oct 2012 10:00:44 +0900
> Subject: [SIPForum-discussion] SIP INFO method and mid-session
>
>  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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