VoIP recording presents a bit more of a challenge for call recorders as there is often no physical audio path to connect into, as the traffic is communicated through IP packets.
Depending on the requested system configuration, the VoIP recording solution offers different ways to plug in:
Central active VoIP recording
This may be installed at any place within the IP network. It receives data by initiating an active third-party conference.
Gateway-side passive VoIP recording
The call recorder analyses data traffic at a gateway (connection to the public telephone network) or at a router (connection to another IP phone network).
Station-side passive VoIP recording
The call recorder taps network connections of each IP phone.
Passive IP recording
Passive IP recording monitors audio packets on the LAN. It may be used in
almost any customer environment and supports virtually all IP vendors.
Active IP recording
Active IP recording operates like an IP softphone. To record a call, a
conference is initiated to the recorder, or the audio streams are routed to
the recorder. It supports the industry standard SIP protocol and preserves call-index information, such as incoming and outgoing phone numbers, time of call, etc., to facilitate search-and-replay.
Call recording solutions typically work in Voice over IP (VoIP) network environments, to record and replay IP-based phone calls.
- Mike Murley of ASC Telecom