SIP User's Manual 356 Document #: LTRT-12801
MP-500 MSBG
6.7.7 DTMF and Hook-Flash Parameters
The DTMF and hook-flash parameters are described in the table below.
Table 6-28: DTMF and Hook-Flash Parameters
Parameter Description
Hook-Flash Parameters
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 = Send proprietary INFO message with Hook-Flash
indication.
 [4] RFC 2833
 [5] INFO (Lucent) = Send proprietary SIP INFO message with
Hook-Flash indication.
 [6] INFO (NetCentrex) = Send proprietary SIP INFO message
with Hook-Flash indication. The SIP INFO message is sent by
the device as follows:
Content-Type: application/dtmf-relay
Signal=16
Where 16 is the DTMF code for hook flash
Notes:
 The FXO interfaces support the receipt of RFC 2833 Hook-
Flash signals and INFO [1] type only.
 The FXS interfaces send Hook-Flash signals only if the
parameter EnableHold is set to 0.
Web/EMS: Hook-Flash Code
[HookFlashCode]
Defines a 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.
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:
 This parameter is applicable only to FXS interfaces.
 It's recommended to reduce the detection time by 50 msec
from the desired value (e.g., if you want to set the value to
200 msec, then enter 150 msec (i.e., 200 minus 50).
 For this parameter to take effect, a device reset is required.
Web: Max. Flash-Hook Detection
Period [msec]
EMS: Flash Hook Period
[FlashHookPeriod]
Defines the hook-flash period (in msec) for both analog and IP
sides (per device).
The valid range is 25 to 3,000. The default value is 700.
For the IP side, it defines the hook-flash period that is reported to
the IP.
For the analog side, it defines the following:
 FXS interfaces:
a) Maximum hook-flash detection period. A longer signal is
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