AudioCodes Mediant 3000 User Manual page 656

Parameter
DTMF Parameters
EMS: Use End of DTMF
[MGCPDTMFDetectionPoint]
Web: Declare RFC 2833 in
SDP
EMS: Rx DTMF Option
[RxDTMFOption]
Tx DTMF Option Table
Web/EMS: Tx DTMF Option
[TxDTMFOption]
SIP User's Manual
Where 16 is the DTMF code for hook flash.

[7] INFO (HUAWAEI) = Sends a SIP INFO message with Hook-
Flash indication. The device sends the INFO message as follows:
Content-Length: 17
Content-Type: application/sscc
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] = DTMF event is reported at the start of a detected DTMF digit
(default).
Defines the supported receive DTMF negotiation method.

[0] No = Don't declare RFC 2833 telephony-event parameter in
SDP.

[3] Yes = Declare RFC 2833 telephony-event parameter in SDP
(default).
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 per IP Profile, using the
IPProfile parameter (see 'Configuring IP Profiles' on page 236).
This parameter table 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 = No negotiation - DTMF digits are sent
according to the parameters DTMFTransportType and
RFC2833PayloadType (default).

[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.
656
Description
Document #: LTRT-89712
Mediant 3000