In newer versions of CUCM, it is possible to activate queuing and overflow on search groups.
If you are using overflow to triggers in the contact center, transfers to the hunt group must not be made via ‘wait on busy’
Search group must be configured in Farlon phonebook similar to others CSQs.
There must also not be used prior UCCX application that redirect to the hunt group. This could be an open / close script.
Both scenarios will result in trigger to trigger where the call is lost to the contact center