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Below is an example network layout for an installation that would allow recording of internal (depends on configuration) and external calls across the telephone network.
Monitoring handsets that are capable of either SCCP or SIP communication allows generic recording to occur no matter what combination of PSTN interfaces are in use (E.G. SIP, PRI, BRI, analogue).
There are two ways the monitoring can be configured for recording extension side audio. The first method will record external calls only, whereas the second will record all calls but will add further load to the managed switch.
External only: The managed switch needs to be configured to mirror the port where the telephone system connects to the telephone network.
All calls: The managed switch needs to be configured to mirror every port that has a telephone connected to it, but the telephone systems network connection doesn’t need to be mirrored.
The second method allows the collection of the internal RTP traffic that would not be seen at the telephone systems network connection.