Failure of call connection from router to PSTN

With R2 signaling adopted, the router cannot establish connection with the subscriber at the switch side.

Use the display current-configuration command to check that the trunking mode on the router matches that on the switch. When the switch adopts outgoing trunking mode, the router must adopt incoming or bidirectional trunking mode. When the switch adopts incoming trunking mode, the router must adopt outgoing or bidirectional trunking mode. When the router adopts incoming trunking mode, it only accepts incoming calls.