By default, SIP uses in-band signaling, sending the DTMF information in the voice stream. However, you can configure it to use RTP-NTE, SIP INFO messages, SIP NOTIFY messages, or KPML for transmitting DTMF tone information.
RTP-NTE is an in-band DTMF relay method, which uses RTP Named Telephony Event (NTE) packets to carry DTMF information instead of voice. If RTP-NTE is configured, SDP is used to negotiate the payload type value for NTE packets and the events that will be sent using NTE. Cisco has two out-of-band procedures for DTMF relay. One uses SIP INFO methods, and the other uses SIP NOTIFY methods. The SIP INFO method sends DTMF digits in INFO messages. It is always enabled. When a gateway receives an INFO message containing DTMF relay information, it sends the corresponding tone. NOTIFY-based out-of-band DTMF relay is negotiated by including a Call-Info field in the SIP INVITE and response messages. This field indicates an ability to use NOTIFY for DTMF tones and the duration of each tone in milliseconds. Using this method can help SIP gateways interoperate with Skinny phones. 2011/7/7 adam compton <[email protected]> > Yes, this is the behavior I have seen in the lab. Because there are 2 call > legs, CME handles the different dtmf types between the phone and CUE. I > could be wrong, but I think 7960s and maybe other phones as well do not > support sip-notify for dtmf-relay. > > Regards, > Adam Compton > > On Thu, Jul 7, 2011 at 11:06 AM, mgscip <[email protected]> wrote: > >> Hi Experts. >> >> Please clarify on this ! >> >> *From:* mgscip <[email protected]> >> *To:* ccie <[email protected]> >> *Sent:* Wednesday, July 6, 2011 10:21 AM >> *Subject:* [OSL | CCIE_Voice] CUE - Voice Mail Access from SIP Phone >> >> Hi All, >> >> When i dial the Voicemail pilot number from SIP Phone dtmf is not >> recognized by the CUE . >> >> once enabled the "dtmf-relay rtp-nte" in the voice register pool it's >> start working. >> >> is the way it's working ? >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com <http://www.platinumplacement.com/> >> >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com <http://www.platinumplacement.com/> >> > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
