43.10.2 DTMF and Hook-Flash Parameters
The DTMF and hook-flash parameters are described in the table below.
Table 43-36: 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 in a Tel Profile.
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 = (Default) Hook-Flash indication is not
sent.
 [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
EnableHold parameter 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).
Web: Max. Flash-Hook Detection
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