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Session/call ID for VoIP

Why is it that there is not something like a session or call ID in various (VoIP and related) protocols that could be used to correlate the various log, billing, etc. events? It would seem this would be useful in many contexts.

A session/call ID like the one you mentioned is available in SIP communications and can be used to track information during a specific call/session. Call/session control is a layer 5 function (OSI Session layer).

However, no such corresponding field or standard is available natively in call logging or billing systems. Therefore, to coordinate and correlate data regarding several layer 5 events from distinct systems today, you must aggregate or join them at a higher layer - the application layer. A good example of how all these systems work together is seen in the SS7 protocols that currently perform these tasks in the PSTN.

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