Configuring Rfc 2833 Payload - AudioCodes Mediant 800B User Manual

received SDP. The device expects to receive RFC 2833 packets with the same
payload type as configured by this parameter. If the remote side doesn't include
'telephony-event' in its SDP, the device sends DTMF digits in transparent mode (as
part of the voice stream).

Sending DTMF digits (in RTP packets) as part of the audio stream (DTMF Relay
is disabled): This method is typically used with G.711 coders. With other low-bit rate
(LBR) coders, the quality of the DTMF digits is reduced. To enable this mode, define
the following:
a. Set the 'Declare RFC 2833 in SDP' parameter to No (RxDTMFOption = 0).
b. Set the '1st Tx DTMF Option' parameter to Not Supported (TxDTMFOption = 0).
c. Set the ini file parameter, DTMFTransportType to 2 (i.e., transparent).

Using INFO message according to Korea mode: DTMF digits are sent to the
remote side in INFO messages. To enable this mode, define the following:
a. Set the 'Declare RFC 2833 in SDP' parameter to No (RxDTMFOption = 0).
b. Set the '1st Tx DTMF Option' parameter to INFO (Cisco) (TxDTMFOption = 3).
Note: In this mode, DTMF digits are removed from the audio stream (and the 'DTMF
Transport Type' parameter is automatically set to Mute DTMF).
Notes:
The following parameters affect the way the device handles the DTMF digits:

TxDTMFOption, RxDTMFOption, RFC2833TxPayloadType, and
RFC2833RxPayloadType

MGCPDTMFDetectionPoint, DTMFVolume, DTMFTransportType, DTMFDigitLength,
and DTMFInterDigitInterval

13.3.3.2 Configuring RFC 2833 Payload

The procedure below describes how to configure the RFC 2833 payload using the Web
interface:

To configure RFC 2833 payload using the Web interface:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media
submenu > RTP/RTCP Settings). The relevant parameters are listed under the
'General Settings' group, as shown below:
Figure ‎ 1 3-5: RFC 2833 Payload Parameters in RTP/RTCP Settings Page
User's Manual

The device is always ready to receive DTMF packets over IP in all
possible transport modes: INFO messages, NOTIFY, and RFC 2833 (in
proper payload type) or as part of the audio stream.

To exclude RFC 2833 Telephony event parameter from the device's
SDP, set the 'Declare RFC 2833 in SDP' parameter to No.
164
Mediant 800B GW & E-SBC
Document #: LTRT-10274