There are many reasons for recording voice over IP call traffic such as: reducing company vulnerability to lawsuits by maintaining recorded evidence, complying with telephone call recording laws, increasing security, employee training and performance reviews, enhancing employee control and alignment, verifying data, sharing data as well as customer satisfaction and enhancing call center agent morale.
[3][4] VoIP is usually implemented as a cost-saving measure over POTS (Plain old telephone systems).
This approach offers some benefits over the long established method of sniffing (Passive) recording in environments where the handsets to be recorded are off site or in remote locations, or in situations where the network routing would mean that a passive solution would be overcomplicated.
"Passive" call-recording software works by using packet filter technology to listen for VoIP calls on the LAN on a monitored port.
The RTP stream is then captured and converted to a WAV file for storage and retrieval.