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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-836ISDN-TRK (DS1 ISDN Trunk)
10
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).
PASS Wait 4 minutes and then check the Error Log for any new errors of type
3073. If there are none, then both sides of the ISDN connection agree on
the service state; the negotiation succeeded. If there is a new 3073 error,
then the negotiation failed (the far-end switch twice failed to respond within
2 minutes). The switch will automatically retry every 15 minutes. If the trunk
was initially in-service, it is now placed in the maintenance/far-end state.
Incoming calls will be accepted, but no outgoing calls can be originated. If
an incoming call is presented, another Service State Audit will be
immediately performed in an attempt to put the DS1 ISDN Trunk in the
proper state.
Table 10-236. 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.
Continued on next page
Table 10-235. TEST #256 Service State Audit Test — Continued
Error
Code
Test
Result Description/ Recommendation
Continued on next page