Display trunk status.
Analog trunk/Digital trunk status:
Available
Busy
Unavailable
Unknown Error
Error Configured: Incorrect signaling configuration between the two
devices. For example, both of the devices are configured as CPE or NET.
SIP Peer trunk status:
Unreachable: The hostname cannot be reached.
Unmonitored: This requires "Keep-alive" to be enabled for the trunk, not the
QUALIFY feature.
Reachable: The hostname can be reached.
SIP Register trunk status:
Registered
Unrecognized Trunk