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

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Configuring the duration before a forced on-hook
In some countries, PBXs do not play busy tones, or the busy tones played only last for a short period of
time. When noise is present on a transmission link, the silence-th-span command might fail to release the
FXO interface after on-hook. In this case, use the hookoff-time command to solve the problem.
To configure the duration before a forced 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. Configure the duration
before a forced on-hook.
hookoff-time time
Optional.
Forced on-hook is disabled by default.
The configuration will take effect on all
interfaces of a card after this command is
executed.
IMPORTANT:
Once forced on-hook is enabled, calls will be automatically disconnected when the duration expires, even
if the conversation is going on.
Configuring the delay time before an on-hook
Usually, after the FXO interface detects a busy tone, the system automatically disconnects the call and
immediately removes the connection. When an FXO subscriber line is used as the VoIP access port can
cooperate with an IP phone, because the IP phone does not play any prompt tone to the IP phone user,
it is easily for the IP phone user to ignore the busy tone and considers that the line failure occurs when
the FXO subscriber line detects the busy tone and removes the connection quickly.
With the delay time before an on-hook configured, when the FXO subscriber line detects a busy tone, it
waits for a period of time, and then disconnects a call and removes the connection. In this case, the busy
tone is first sent to the FXO interface and then sent to the IP phone, and the IP phone user will easily
confirm the busy tone information before the connection is removed.
To configure the delay time before an on-hook for the FXO voice subscriber line:
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. Configure the delay time
before an on-hook for the
FXO voice subscriber line.
busytone-hookon timer seconds
Optional.
The default delay time is 0 seconds.
Configuring the off-hook mode
There are two off-hook modes after the FXO voice subscriber line receives ringing: