find the ISDN device turned off when not in use. This is usually caused by the
router being plugged into a power strip attached to a PC.
this as an error, and disconnect the circuit on the central office switch. When
the user returns power to the circuit, this prevents connectivity because the
switch no longer expects a connection. The show isdn status command
provides an indication of problems that require contacting the phone com-
pany, and this should be considered if the user has disconnected the power
or the ISDN phone cable. It is recommended that administrators instruct
users to never disconnect the cable or power.
connections, including the number dialed, the success of the connection,
the idle timers that control the duration of a DDR connection without
data packets, and the number of calls that were screened or rejected due
to administrative policy.
addresses to ISDN numbers, can be implemented incorrectly. For example,
IP address one is linked to number B instead of A. Although the router dials
and the ISDN connection may succeed, it cannot pass packets due to Layer
3 mismatches. Note the Idle timer (120 secs) notation, which reflects the
default Idle timer of two minutes for each B channel. The Idle timer shuts
down the connection when no packets have traversed the link.
Dial String Successes Failures Last called Last status
18008358661 2 0 00:02:49 successful
0 incoming call(s) have been screened.
0 incoming call(s) rejected for callback.
BRI0:1 - dialer type = ISDN
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle