SIP User's Manual 424 Document #: LTRT-65415
MediaPack Series
10.12.2 DTMF and Hook-Flash Parameters
The DTMF and hook-flash parameters are described in the table below.
Table 10-37: DTMF and Hook-Flash Parameters
Parameter Description
Hook-Flash Parameters
Web/EMS: Hook-Flash Code
[HookFlashCode]
Defines the digit pattern that when received from the Tel
side, indicates a Hook Flash event.
The valid range is a 25-character string. The default is a
null string.
Note: This parameter can also be configured per Tel
Profile, using the TelProfile parameter.
Web/EMS: Hook-Flash Option
[HookFlashOption]
Determines the hook-flash transport type (i.e., method by
which hook-flash is sent and received).
 [0] Not Supported = Hook-Flash indication isn't sent
(default).
 [1] INFO = Sends proprietary INFO message with
Hook-Flash indication.
 [4] RFC 2833
 [5] INFO (Lucent) = Sends proprietary SIP INFO
message with Hook-Flash indication.
 [6] INFO (NetCentrex) = Sends proprietary SIP INFO
message with Hook-Flash indication. The device
sends the INFO message as follows:
Content-Type: application/dtmf-relay
Signal=16
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
Notes:
 FXO interfaces support only the receipt of RFC 2833
Hook-Flash signals and INFO [1] type.
 FXS interfaces send Hook-Flash signals only if the
parameter EnableHold is set to 0.
Web: Min. Flash-Hook Detection Period
[msec]
EMS: Min Flash Hook Time
[MinFlashHookTime]
Defines the minimum time (in msec) for detection of a
hook-flash event. Detection is guaranteed for hook-flash
periods of at least 60 msec (when setting the minimum
time to 25). Hook-flash signals that last a shorter period of
time are ignored.
The valid range is 25 to 300. The default value is 300.
Notes:
 For this parameter to take effect, a device reset is
required.
 This parameter is applicable only to FXS interfaces.
 It's recommended to reduce the detection time by 50
msec from the desired value. For example, if you want
to set the value to 200 msec, then enter 150 msec
(i.e., 200 minus 50).
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