|Configuring VSTG Properties / Configuring DTMF|
The Vocera SIP Telephony Gateway supports DTMF events as RTP payload as specified in the RFC 2833.
For more information on the RFC, refer to RFC 2833.
If your IP PBX does not handle DTMF events as RTP payload and you do not use a media termination point (MTP) to convert out-of-band SIP Notify DTMF messages into RFC 2833 in-band (RTP), Vocera recommends that you connect to the PBX via a T1 ISDN-PRI circuit. This would connect to a media gateway (such as a Sangoma Media Gateway), and then to the Vocera SIP Telephony Gateway, as shown in the following figure.