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ISDN-TRK (DS1 ISDN Trunk)
Issue 5 October 2002
1323
555-233-119
Call State Audit Test (#257)
If a call is active on the trunk, the switches on both sides of the connection should
agree on the ISDN state of the call, as defined in the ISDN Protocol Specification.
This test audits internal call state data by querying the far-end switch as to the
ISDN state of the call. It can be helpful when trying to clear a hung call. If the
internal call state data on the near-end switch is different than that of the far-end
switch, then the call will be torn down.
As with Test #256 (Service State Audit), a PASS simply means that an appropriate
message was composed and sent to the far-end switch. The ISDN Specification
allows up to two minutes for a reply. If a reply is not received within the two minute
window, a protocol time-out violation will be recorded in the error log against the
associated signaling channel (ISDN-PRI Signaling Link Port, which is listed in the
Error Log as ISDN-LNK/ISDN-PLK; the Error Type is 1).
Table 323. TEST #257 Call State Audit Test
Error
Code Test
Result Description/ Recommendation
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.
1019 ABORT An audit is already in progress.
1. Wait two minutes and try again.
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).
1114 ABORT The signaling link is in a transitional state.
1. Retry the command at 1-minute intervals a maximum of 5 times.
1116 ABORT The trunk is in an out-of-service ISDN service state.
1. A call cannot be present if the trunk is in an ISDN out-of-service state,
so a call state audit would be inappropriate. No action necessary. (Use
the status trunk
2100 ABORT Could not allocate the necessary system resources to run this test.
1. Retry the command at 1-minute intervals a maximum of 5 times.
FAIL Internal system error
1. Retry the command at 1-minute intervals a maximum of 5 times.
PASS This switch sent a call state auditing message to the far-end switch to verify
the state of the call active on this trunk. If a call state mismatch is found,
then the call will be torn down within two minutes. If no call was active, then
no message was sent.
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