[SIPForum-discussion] A method to send DTMF as RTP packets

[Eric Burger]

RFC 2976 does not state how to send DTMF over a SIP INFO request.  RFC  
2976 simply states it is possible.

For example, the UAC sends and INFO with a payload "User Pressed the 1  
key". The UAS expects an INFO with a payload "0x01". No  
interoperability here.

On Feb 7, 2009, at 6:40 AM, Hasini Gunasinghe wrote:

> Hi,
> Thank you very much for all the replies. Actually I was looking for  
> any tool, a filter or an API to achieve the task of sending DTMF as  
> stated in RFC 2833. In other words, I used RTC Client API to  
> implement the SIP  Stack and used various directshow filters to  
> implement the media stack. And these days I am looking for a way to  
> send DTMF from our soft phone.
>
> And to Eric's question, RFC 2976 states how DTMF is sent as SIP  
> INFO. That functionality is provided with RTC Client API.
>
> Thank you again.
> regards,
> Hasni.
>
>
> On Sat, Feb 7, 2009 at 7:23 AM, Eric Burger <eburger at sipforum.org>  
> wrote:
> RFC 4733 for RTP.
>
> How did you do SIP INFO? There is no published specification.
>
> Another option is RFC 4730, in NOTIFY.
>
>
> On Feb 5, 2009, at 9:33 PM, Hasini Gunasinghe wrote:
>
> Hi,
>
> I am developing a SIP soft phone application in C++ for windows.  
> There I need to implement the functionality of sending DTMF. I  
> implemented it using SIP INFO method. I also need to implement  
> sending DTMF as RTP packets. I was searching for a method to do that  
> but still did not find a solution. If any of you know a way to  
> achieve it (sucha as a filter which sends DTMF as RTP data) please  
> do reply. It would be a great help.
>
> Thank you.
> regards,
> Hasini.
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