AudioCodes Mediant 1000B - Configuring DTMF Transport Types

Version 7.2 201 Mediant 1000B Gateway & E-SBC
User's Manual 14. Media
The following procedure describes how to configure CNG through the Web interface.
 To configure CNG:
1. Open the RTP/RTCP Settings page (Setup menu > Signaling & Media menu >
Media folder > RTP/RTCP Settings). The relevant parameters are listed under the
General group, as shown below:
Figure 14-9: Comfort Noise Parameter in RTP/RTCP Settings Page
2. Set the 'Comfort Noise Generation Negotiation' parameter (ComfortNoiseNegotiation)
to Enable.
3. Click Apply.
Note: This feature is applicable only to the Gateway application.
14.3.3 Configuring DTMF Transport Types
The device supports various methods for transporting DTMF digits over the IP network to
the remote endpoint. The methods and their configuration can be configured on the DTMF
& Dialing page (Setup menu > Signaling & Media tab > Gateway > DTMF &
Supplementary > DTMF & Dialing):
Figure 14-10: Configuring DTMF Transport

Using INFO message according to Nortel IETF draft: DTMF digits are sent to the
remote side in INFO messages. To enable the mode:
a. Set the 'Declare RFC 2833 in SDP' parameter to No (RxDTMFOption = 0).
b. Set the 'First Tx DTMF Option' parameter to INFO Nortel (FirstTxDTMFOption =
1).
Note: DTMF digits are removed from the audio stream (and the 'DTMF Transport
Type' parameter is automatically set to Mute DTMF).

Using INFO message according to Cisco’s mode: DTMF digits are sent to the
remote side in INFO messages. To enable the mode:
a. Set the 'Declare RFC 2833 in SDP' parameter to No (RxDTMFOption = 0).
b. Set the 'First Tx DTMF Option' parameter to INFO Cisco (FirstTxDTMFOption =
3).
Note: DTMF digits are removed from the audio stream (and the 'DTMF Transport
Type' parameter is automatically set to Mute DTMF).

Using NOTIFY messages according to IETF Internet-Draft draft-mahy-sipping-
signaled-digits-01: DTMF digits are sent to the remote side using NOTIFY
messages. To enable the mode: