Hello, we have a Cisco ISR 4300 voice router with six FXO lines. For some reason the service privider can not configure a header line for them, so when one of these ports is busy a new call to it is rejected.
Is there some way to configure a sort of Call Forward Busy to these ports so that when they are busy a new call can be diverted to some of the other lines?
Inbound POTS hunting (linear hunting or a hunt group) is only controlled by your provider. If you have DID numbers somewhere else in your environment, you might be able to remote call forward (RCF) the main number of that POTS group to a DID.
hunt-scheme ? least-idle The interface with timeslot, that has been idle least, is selected least-used The interface with maximum free timeslots is selected longest-idle The interface with timeslot, that has been idle longest, is selected random The timeslot is selected randomly round-robin The next interface with free timeslots is selected sequential The interface with highest preference is selected
The design Ipersing describes is for outgoing calls.
I understood you to say that your service provider cannot route an inbound call to a second (or more) POTS line if the first is busy. If that is correct, then there isn't anything you can do in the UC environment. The second call does not reach your system.