R2511-HP MSR Router Series Voice Configuration Guide(V5)

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NOTE:
Before you configure the number of busy tone detection periods, test the new value repeatedly to make
sure that the new value does not cause failed or false on-hook.
Enabling the busy tone sending
If the PBX fails to play a busy tone to a digital telephone, enable the FXO interface to send a busy tone
to the PBX, which will transparently send the busy tone to the digital telephone.
To enable the busy tone sending:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter FXO voice subscriber
line view.
subscriber-line line-number N/A
3. Enable the busy tone sending.
send-busytone { enable | time
seconds }
Optional.
Disabled by default.
The time option appears only after
the send-busytone enable
command is executed.
Enabling silence detection-based automatic on-hook
Silence detection-based automatic on-hook prevents the situations where the resource of the FXO
interface cannot be released owing to busy tone detection failure when the busy tone parameters
provided by the connected PBX are special.
When the signal values of two successive sampling points are less than the silence threshold, the system
considers that the line goes into the silent state. If the line stays in the silent state longer than the silence
duration for automatic on-hook, the system will automatically disconnect the call.
Do not enable silence detection-based automatic on-hook unless you are sure it is necessary. Improper
configuration of this function can lead to false on-hook.
To enable silence detection-based automatic on-hook:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter FXO voice subscriber
line view.
subscriber-line line-number N/A
3. Enable silence
detection-based automatic
on-hook.
silence-th-span threshold
time-length
Optional.
By default, the silence threshold is
3 and the silence duration for
automatic on-hook is 7200
seconds (2 hours).
NOTE:
It is a
g
ood practice to test multiple sets of parameters and choose the set of parameters that can quickl
y
release the FXO voice subscriber line after on-hook and does not cause false on-hook.