AudioCodes Mediant 3000 User Manual page 747

User's Manual
Parameter
DTMF Parameters
EMS: Use End of DTMF
[MGCPDTMFDetectionP
oint]
Web: Declare RFC 2833
in SDP
EMS: Rx DTMF Option
[RxDTMFOption]
Tx DTMF Option Table
Web/EMS: Tx DTMF
Option
[TxDTMFOption]
Version 6.6
event=flashhook
Note:The device can interwork DTMF HookFlashCode to SIP INFO
messages with Hook Flash indication.
Determines when the detection of DTMF events is notified.

[0] = DTMF event is reported at the end of a detected DTMF digit.

[1] = (Default) DTMF event is reported at the start of a detected
DTMF digit.
Defines the supported receive DTMF negotiation method.

[0] No = Don't declare RFC 2833 telephony-event parameter in
SDP.

[3] Yes = (Default) Declare RFC 2833 telephony-event parameter
in SDP.
The device is always receptive to RFC 2833 DTMF relay packets.
Therefore, it is always correct to include the 'telephony-event'
parameter as default in the SDP. However, some devices use the
absence of the 'telephony-event' in the SDP to decide to send DTMF
digits in-band using G.711 coder. If this is the case, you can set this
parameter to 0.
Note: This parameter can also be configured in an IP Profile.
This table parameter configures up to two preferred transmit DTMF
negotiation methods. The format of this parameter is as follows:
[TxDTMFOption]
FORMAT TxDTMFOption_Index = TxDTMFOption_Type;
[\TxDTMFOption]
Where Type is:

[0] Not Supported = (Default) No negotiation - DTMF digits are
sent according to the parameters DTMFTransportType and
RFC2833PayloadType.

[1] INFO (Nortel) = Sends DTMF digits according to IETF Internet-
Draft draft-choudhuri-sip-info-digit-00.

[2] NOTIFY = Sends DTMF digits according to IETF Internet-Draft
draft-mahy-sipping-signaled-digits-01.

[3] INFO (Cisco) = Sends DTMF digits according to Cisco format.

[4] RFC 2833.

[5] INFO (Korea) = Sends DTMF digits according to Korea
Telecom format.
For example:
TxDTMFOption 0 = 1;
TxDTMFOption 1 = 3;
Notes:

DTMF negotiation methods are prioritized according to the order of
their appearance.

When out-of-band DTMF transfer is used ([1], [2], [3], or [5]), the
parameter DTMFTransportType is automatically set to 0 (DTMF
digits are erased from the RTP stream).

When RFC 2833 (4) is selected, the device:
a. Negotiates RFC 2833 payload type using local and remote
747
53. Configuration Parameters Reference
Description
Mediant 3000