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rtpengine/docs/call_recording.md

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Call Recording

Call recording can be accomplished in one of two ways:

  • The rtpengine daemon can write libpcap-formatted captures directly (--recording-method=pcap);

  • The rtpengine daemon can write audio frames into a sink in /proc/rtpengine (--recording-method=proc). These frames must then be consumed within a short period by another process; while this can be any process, the packaged rtpengine-recording daemon is a useful ready implementation of a call recording solution. The recording daemon uses ffmpeg libraries to implement a variety of on-the-fly format conversion and mixing options, as well as metadata logging. See rtpengine-recording -h for details.

Important note: The rtpengine daemon emits data into a "spool directory" (--recording-dir option), by default /var/spool/rtpengine. The recording daemon is then configured to consume this using the --spool-dir option, and to store the final emitted recordings (in whatever desired target format, etc.) in --output-dir. Ensure that the --spool-dir and the --output-dir are different directories, or you will run into problems (as discussed in #81).