Many things, you need to give us some more details, i..e system you are using CUCM, CME, etc, call flow details, if external call what type of circuit is used i.e. PRI, SIP trunk, POTS, etc and appropriate debugs for the circuit. If you can answer these we can hopefully steer you further.
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This topic is a chance to discuss more about how to read Cisco Unified Communications trace files. In this session, Cisco D...