Patent ID: 7336655

Claim:
A CDR (call detail recording) system, used in case of communication with IP (Internet Protocol) phones, which connects a plurality of phones via communication means for exchanging therebetween voice data representing a call made between the phones in a voice packet with an IP packet format, comprising: call controlling means for controlling an outgoing call and an incoming call from/to a phone; transferring means for transferring the voice packet to a receiving side phone (or a calling side phone) upon receipt thereof from the calling side phone (or the receiving side phone); and call detail recording means for recording the voice packet upon receipt thereof from the calling side phone and the receiving side phone; wherein a voice packet representing a call between a plurality of phones is recorded in recording means; and the call controlling means comprises: condition acquiring means for acquiring a condition for deciding whether or not to record the voice packet representing the call between the phones; deciding means for deciding whether or not to record the voice packet representing the call between the phones based on the acquired condition; and destination transmitting means for transmitting information relating to a destination with which a call with the transferring means is to be established, to the calling side phone (or the receiving side phone), in case where the deciding means has decided to record the voice packet representing the call between the phones.