HP FlexNetwork MSR Series Configuration Manual page 72

Figure 16 Network diagram
As shown in
busy tones to Router A, which disconnects the line after detecting the busy tones and sends a
disconnect message to Router B. Router B sends the message to PBX B that then plays busy tones
to Telephone B. The whole disconnection process is done. If the FXO voice subscriber line on Router
A cannot detect the busy tone played by PBX A, the call cannot be terminated.
Solution
•
If the PBX uses North American busy tone specification but the router uses European
specification (the default specification), issue the area north-america command in subscriber
line view on the router to change the busy tone specification. If the problem persists, proceed
with the next step.
•
Automatic busy tone recognition: The automatic busy tone recognition technology uses
software to sample and analyze busy tones to produce a set of parameters that represent the
most common patterns of busy tones. After configured with these parameters, the FXO ports
can recognize different types of busy tones.
For information about the procedure of automatic busy tone recognition test, see
detection." If the test fails, repeat the operations till the busy tones can be recognized.
Figure 16, suppose Telephone A hangs up first after conversation, then PBX A plays
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"Busy tone