G.711 and ADPCM G.726/32KBps can be used to send DTMF digits inband. Using G.723 or G.729 codecs for DTMF is much less recommended.
Nachum AudioCodes -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, December 07, 2004 12:43 PM To: 'Sip-Implementors (E-mail)' Subject: [Sip-implementors] DTMF in codecs Can I somewhere find out which codecs that can be used to send in-band DTMF? I know that it is possible using for example g.711, but how about other codecs? I guess there is a risk that the compression of the codec is to "narrow" so that frequencies that are needed for transporting DTMF will be left out? This means that DTMF cant be sent in-band for that codec, am I correct? Does someone know of a list where I can find this info? I'm especially interested in g.711, g723 and g729. Thanks, // Andreas _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors ************************************************************************************************************ This email and any files transmitted with it are confidential material. They are intended solely for the use of the designated individual or entity to whom they are addressed. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination,use, distribution or copying of this communication is strictly prohibited and may be unlawful. If you have received this email in error please notify [EMAIL PROTECTED] and permanently delete the e-mail and files. *********************************************************************************************************** _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
