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Inbound calls over PRI give a fast busy to caller.

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Posted by sagitraz

Fast busy is sounds twice as normal busy could be same as all circuits are Busy.
Mostly the trunks connected to you carrier is Busy or they are having an outage or even overloaded condition on Far end. Sometime user can also be on other line (Possible). Also check the channels are idle.

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Posted by crouse

Fast busy is sounds twice as normal busy could be same as all circuits are Busy.
Mostly the trunks connected to you carrier is Busy or they are having an outage or even overloaded condition on Far end. Sometime user can also be on other line (Possible). Also check the channels are idle.

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Posted by alwin