[SIPForum-discussion] DTMF

[praveen subbarao]

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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