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Channels and voice operations cards on the IR system can go out of service for a variety of reasons. When that happens, following the procedures presented in this section may restore channels, NMS cards, or VOIP cards to service. Most out-of-service conditions are the result of administration errors or intermittent problems, rather than actual hardware failures. By taking the time to troubleshoot, you may be able to resolve the problem yourself.
When you troubleshoot problems with cards and channels, bear in mind that as long as even one channel on a card is operating, the card will be in the in service (INSERV) state. If a card is out of service, all channels connected to the card are not operating.
