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UC Monitor can usually correlate call legs belonging to the same end-to-end call so that they are identified in a meaningful way. UC Monitor correlates audio call legs by the IP address and port combination of their two associated endpoints. For typical IP-only calls, the two call legs involve the same endpoints, which are reversed to show the direction of call flow. For PSTN call legs, the voice gateway creates a Global Call Identifier (GCI). The collector or Lync collector correlates the GCI with the ID in the call setup packet for the leg terminating on a gateway port.
Avaya call-processing hardware does not provide information about call direction until the call is complete. This information is available in UC Monitor reports only when the Avaya Communication Manager sends call detail records (CDR) to the collector. An asterisk identifies calls that lack the required CDR data to identify the direction of call data flow.
Call legs that include a video stream are more complicated to correlate. To the management console, they appear to be pairs of separate calls that media devices route and translate in the path. To handle these cases, session-level correlation is available as a filtering option in the Calls Overview.
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