| 摘要 |
A method of and system (23) for monitoring the conditions of channels in a multichannel telecommunications line (17a, 17b), wherein each of the traffic channels uses A/B bit signalling to signal their condition. Whenever the system detects a setup acknowledgement message in a command channel that includes a call reference and a channel identifier, the system (23) displays the detected setup acknowledgement message and monitors the channel identified by said channel identifier for a change in line status, as indicated by a change in its A/B bits. In response to detection of a change in the A/B bits of the channel identified by the channel identifier, the system decodes the A/B bits and displays the changed line status.
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