System and method for distributed call monitoring/recording using the session initiation protocol (SIP)

A method for remote call monitoring comprising:

• a. setting up a call from a first SIP device to a second SIP device;
• b. deriving information from a first SIP INVITE message from the first SIP device;
• c. deriving information from a SIP response message from the second SIP device, wherein the SIP response message is sent in response to the first SIP INVITE message;
• d. generating one or more additional SIP INVITE messages using the information from at least both the first SIP INVITE message and the information from the SIP response message;
• e. sending the one or more additional SIP INVITE messages to a monitor to set up a first media stream from the first SIP device and/or a second media stream from the second SIP device to the monitor;
• and
• f. receiving the first media stream and/or the second media stream at the monitor.

A method for distributed call monitoring comprising:

• a. in response to receiving a first SIP INVITE of a first SIP device for a second SIP device to join a call with the first SIP device, sending the first SIP INVITE to the second SIP device, deriving SDP information from the first SIP INVITE, and sending a second SIP INVITE with the SDP information to a monitor thereby to set up a first media stream between the first SIP device and the monitor;
• b. in response to receiving a SIP OK of the second SIP device responsive to the first SIP INVITE, deriving SDP information from the SIP OK and sending a third SIP INVITE with the SDP information to the monitor thereby to set up a second media stream between the second SIP device and the monitor;
• and
• c. sending copies of call traffic sent by the first SIP device and of call traffic sent by the second SIP device as the first and the second media streams to the monitor.