This read-write INTEGER, used only for VoIP trunking with CCS signaling, chooses whether PRI D-channel LAPD trunk messages are sent on the control channel (the default) or the bearer channel. This gives an admin the ability to route D-channel signaling over the bearer network path instead of control when the control and bearer networks are physically separated. For example, in a deployment where control traffic goes over a management network fully isolated from the bearer/media network, an admin would set vismVoIpLapdTrunkPVC to bearer so LAPD trunk messages actually reach their destination.