You can use the INFO message.
rfc 2976, and I think there is a draft detailing how to encode the
INFO message.
However I think that rfc 2833, is more preferable. See:
http://search.ietf.org/internet-drafts/draft-rosenberg-sip-app-components-01
.txt
----- Original Message -----
From: "Martin Pr�fontaine" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, April 23, 2001 4:55 PM
Subject: [Sip-implementors] DTMFs
> Hi,
>
> How would you transmit DTMFs using SIP (Standard Way)
>
> Is there any way to avoid using the RTP stream to transmit DTMFs?
>
> Thanks
>
> Martin Pr�fontaine
> Software Engineer
>
> Interstar Technologies Inc.
> 5835 Verdun Avenue, 3rd Floor
> Montr�al, Qu�bec
> Canada H4H 1M1
>
> Tel.: 1 (514) 766-1668 (4457) (EST)
> Fax: 1 (514) 766-1439
> Email: [EMAIL PROTECTED]
> Web: http://www.faxserver.com
>
>
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