Description: The object indicates the connection mode of the interface. normal - the interface acts normally to handle incoming and outgoing call. trunk - the interface acts in trunking mode. trunking mode causes two interfaces (on either the same or different routers) to be always conferenced together, and for telephony signaling to be passed transparently through the VoIP system rather than trapped and interpreted by the session application on the router(s). plar - the interface acts in PLAR (private line automatic ringdown) mode. PLAR is handled by associating a peer directly with an interface such that when the interface goes off-hook, that peer is used to setup the second call leg and conference them together without the caller having to dial any digits. tieline- the interface acts in tie-line mode. This specifies a connection that emulates a temporary tie-line trunk to a PBX. A tie-line connection is automatically set up for each call and torn down when the call ends.