CallerID works as long as your provider is sending it - bear in mind on Telecom ISDN CallerID is charged separately, make sure they have turned it on. We have a number of deployments using ISDN in NZ that work fine with CLI (most use SIP).
If this was configured using the command line and you are using analogue services, then make sure that 'caller-id enable' is configured under the voice-ports. If configured with CCA then you can ignore that as CCA applies this by default.
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