[SIPForum-discussion] DTMF

Wed May 23 07:46:32 UTC 2007

Yes.

"Srinivas ." <nsrinivas at techmahindra.com> 
Sent by: discussion-bounces at sipforum.org
05/23/2007 12:08 PM

To
"praveen subbarao" <praveen_subbarao at rediffmail.com>, "Eric Burger" 
<eburger at bea.com>
cc
discussion <discussion at sipforum.org>
Subject
Re: [SIPForum-discussion] DTMF

To avoid confusion let me put it as two different cases.

Case 1. PSTN user just picks the phone and dials the number, here the 
dialed numbers will be passed in Request URI / To fields of INVITE.
            Request and To headers will be in the form of tel uri. (It may 
be in the form of E.164 number format, depends on the number dialed).

Case 2. Suppose the call is established and user hear some announcements 
(IVR) to get some more info. In such cases (mid call dialing) the dialed 
numbers are carried in RTP (payload type as DTMF).

Am I correct?

From: discussion-bounces at sipforum.org 
[mailto:discussion-bounces at sipforum.org] On Behalf Of praveen subbarao
Sent: Wednesday, May 23, 2007 11:23 AM
To: Eric Burger
Cc: discussion
Subject: Re: [SIPForum-discussion] DTMF

Hi Eric,

Thanks for the reply. What i understand is that, the digits will be 
converted to some form of address & will be put in INVITE. Is it some 
thing called ENUM?? Let me know

Praveen

On Tue, 22 May 2007 Eric Burger wrote :
>It looks like Praveen is asking how the dialed-number gets conveyed.  The
>whole point is digits do not traverse the network; addresses do.  See SS7
>ISUP for how this works in the PSTN.  Either the phone (if SIP-enabled) 
or
>gateway collects the digits and formulates the target address and puts it
>into an INVITE.
>
>
>On 5/21/07 3:52 AM, "dipanjan.dutta at aricent.com"
><dipanjan.dutta at aricent.com> wrote:
>
> >
> > Hi Praveen,
> >
> > DTMF information gets exchange after the media patch is  connected. It 
is also
> > called in-band signaling,
> > The media path can be connected either through early media connection 
or
> > through 200-ACK.
> >
> > Further if any of the endpoint presses any digit in DTMF mode, this
> > information is conveyed over media path using RTP. RTP header will 
indicate
> > DTMF payload and inside the payload, the DTMF event would be encoded 
using RFC
> > 2833.
> >
> > While the UAs do initial signaling, they can a priori do a media 
negotiation
> > for audio/telephone-event MIME type through SDP, so that anytime 
afterwards
> > during a call, direct switching to DTMF in RTP can go on w/o issues.
> >
> > thanks,
> > Dipanjan
> >
> >
> >
> >
> > "praveen subbarao" <praveen_subbarao at rediffmail.com>
> > Sent by: discussion-bounces at sipforum.org 05/21/2007 11:56 AM
> > Please respond to
> > praveen subbarao <praveen_subbarao at rediffmail.com>
> > To
> > "discussion" <discussion at sipforum.org>
> > cc
> > Subject
> > [SIPForum-discussion] DTMF
> >
> >
> >
> >
> > Hi All,
> >
> > I have a doubt in SIP. Supposing that a SIP client wish to communicate 
with a
> > PSTN client, then he will input the PSTN number.
> >
> > In SIP, where & how the DTMF information is carried. Which are the 
headers
> > responsible for this? I rquest to knidly clarify.
> >
> > Regards,
> > Praveen
> >
> >
> >
> > <
http://adworks.rediff.com/cgi-bin/AdWorks/click.cgi/www.rediff.com/signature-

> > 
home.htm/1050715198 at Middle5/1189676_1183578/1188797/1?PARTNER=3&OAS_QUERY=
> > null target=new>
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