Version 5.8 357 October 2009
SIP User's Manual 6. Configuration Parameters Reference
Parameter Description
considered an off-hook or on-hook event.
b) Hook-flash generation period upon detection of a SIP INFO
message containing a hook-flash signal.
 FXO interfaces: Hook-flash generation period.
Notes:
 For FXO interfaces, a constant of 100 msec must be added to
the required hook-flash period. For example, to generate a
450 msec hook-flash, set this parameter to 550.
 For this parameter to take effect, you need to reset the
device.
DTMF Parameters
EMS: Use End of DTMF
[MGCPDTMFDetectionPoint]
Defines 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).
Web: Declare RFC 2833 in SDP
EMS: Rx DTMF Option
[RxDTMFOption]
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 designed to always be 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 RxDTMFOption to 0.
Web/EMS: Tx DTMF Option
[TxDTMFOption]
Determines a single or several preferred transmit DTMF
negotiation methods.
 [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
<draft-choudhuri-sip-info-digit-00>.
 [2] NOTIFY = Sends DTMF digits according to IETF <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.
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).
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