There are two ways you can send the DTMF. (1) Through SIP - Use INFO messages to communicate the dtmf content (2) Through Media - Use RFC 2833 header in RTP to convey the DTMF
and the old POTS way is detecting the DTMF through pulses in PCMA / PCMU. If you are asking about API, that would be specific to SIP Stack or Media Stack you are using. -Somesh * Please donot take the print out of this e-mail unless its absolutely necessary * -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Hasini Gunasinghe Sent: Thursday, January 22, 2009 5:34 PM To: [email protected] Subject: [Sip-implementors] How to add sending DTMF functionality to a SIPSoft Phone Application Hi, I am developing a SIP Soft phone application for windows in C++. I need to send DTMF as user presses keys, to the other party. 1) Is it a SIP Stack functionality or a media stack functionality? 2) Does any one knows about an API that provides application developers to add this functionality to the applications? I apologize if this question is irrelevant to this mailing list. But when I searched for this, I found facts related to both SIP side and media side. Thank you. regards, Hasini. _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
