3Com VCX v7111 User Manual page 182

Parameter
Comfort Noise Generation Negotiation
[ComfortNoiseNegotiation]
Configuring the Hook-Flash Settings
To configure the Hook-Flash Settings parameters:
Open the Hook-Flash Settings screen (Advanced Configuration menu > Media Settings >
1
Hook-Flash Settings option); the Hook-Flash Settings screen is displayed.
Hook-Flash Settings Screen
Figure 64
Configure the Hook-Flash Settings according to
2
Click Submit to save your changes.
3
To save the changes so they are available after a power fail, see
4
Media Settings, Hook-Flash Settings Parameters
Table 59
Parameter
Min. Flash-Hook Detection Period
[msec]
[MinFlashHookTime]
182
Description
Enables negotiation and usage of Comfort Noise (CN).
Valid options include:
[0] = Disable (default)
[1] = Enable Comfort Noise negotiation
The use of CN is indicated by including a payload type for CN on the
media description line of the SDP. The gateway can use CN with a
codec whose RTP timestamp clock rate is 8,000 Hz (G.711/G.726).
The static payload type 13 is used. The use of CN is negotiated
between sides; therefore, if the remote side doesn't support CN, it is
not used.
Silence Suppression must be enabled to generate CN.
Table
Description
Sets the minimal time (in msec) for detection of a flash-hook event (for
FXS only).
The valid range is 25 to 300. The default value is 300 msec.
Detection is guaranteed for flash hook periods of at least 60 msec
(when setting the minimal time to 25). Flash-hook signals that last a
shorter period of time are ignored.
It is recommended to reduce the detection time by 50 msec
from the desired value (for example, if you set the value to
200 msec, then enter 150 msec (that is 200 minus 50).
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VCX V7111 VoIP Gateway User Guide
Configuration.