When what matters is.. What was said? rather than.. Who said it?
Trunk recorders for physical lines are based on a line interface appliance connected to the telephone network and to the server PC.
In case of SIP trunk recording, the connection is through a managed switch with port mirroring. This type of recorders are generally used for blanket recording, but recording on-demand may also be obtained via DTMF sequences, as well as on-demand recording and cancellation of current recording for users with sufficient rights.
While recording is made at the trunk level, recall is able to identify the extension associated to each call via the CDR output of the PBX. Availability and limitations are to be checked on a case by case basis
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