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ISDN-TRK (DS1 ISDN Trunk)
Issue 5 October 2002
1321
555-233-119
Service State Audit (#256)
These trunks may be in one of several service states. This test performs a Service
State Audit with the far-end switch.
For interfaces using country protocol 1 (including US), the Service State Audit
executes in all trunk service states. A message is sent to the far-end switch to
ensure that both sides agree on the service state. A PASS for this test simply
means that the message has been successfully sent. Two minutes are allowed for
a reply. If no reply is received within that 2 minute window, the message is sent
out again. If that attempt fails, an error is logged (Error Type 3073) and the switch
then attempts another Service State Audit every 15 minutes. If the trunk was
initially INS (in-service), it is then placed in the MTC/FE (maintenance state,
far-end problem) state. No outgoing calls are placed over this trunk, but incoming
calls are accepted. If an incoming call is presented while in such a state, a Service
State Audit attempt is immediately attempted (that is, the switch does not wait for
the 15-minute cycle, but tries to recover immediately).
For interfaces not using country protocol 1, the Service State Audit executes only
if the trunk is in the OOF/FE state. A message is sent to the far-end switch to
attempt to bring the trunk back into the in-service state. A PASS for this test
simply means that the message has been successfully sent. Two minutes are
allowed for a reply. If no reply is received within that two minute window, the
message is sent out once again. If no response is received in the next two minute
window, then the trunk remains in the OOS/FE state. The switch will attempt
another Service State Audit in another hour.
To investigate the service state of the DS1 ISDN Trunk, issue the status trunk
trunk-group/trunk-member command.
Table 322. TEST #256 Service State Audit Test
Error
Code Test
Result Description/ Recommendation
1000 ABORT System resources required to run this test are not available. The port may
be on a valid call. Use status station or status trunk to determine when
trunk is available for testing.
1. Check the results of Test #255 (Signaling Link State Check).
1018 ABORT Maintenance is disable on this trunk.
1. Enable maintenance by entering y in the
Maintenance Tests?
field
on page 2 of the change trunk-group form.
1113 ABORT The signaling link has failed, so the system cannot send any messages on
behalf of this trunk.
1. Check the results of Test #255 (Signaling Link State Check).
Continued on next page