This test audits internal call state data by querying the far-end terminal adapter as to the ISDN state of the call. This can be helpful when trying to clear a hung call. If a call is active on the port, the switches on both sides of the connection should agree on the ISDN state of the call as defined in the ISDN Protocol Specification. If the internal call state data on the near-end switch is different than that of the far-end terminal adapter, the call will be torn down.
The ISDN specification allows up to 2 minutes for a reply. If a reply is not received within the 2 minute window, the test logs a protocol time-out violation against the associated signaling channel (Error Type 1 for ISDN-PLK).
This test is run on the following maintenance objects:
