Abstract: Call recording in an Internet telephone system is provided. A dual-mode terminal includes a call server interworker for, when a cellular call commences, determining whether it is possible to access a call server which controls Voice over Internet Protocol (VoIP) calls; a recording interface processor for, when it is possible to access the call server, setting a connection to a recording server; a recorder for generating recording data packets comprising a cellular phone conversation; and a data communicator for transmitting the recording data packets to the recording server.

Abstract: Call recording in an Internet telephone system is provided. A dual-mode terminal includes a call server interworker for, when a cellular call commences, determining whether it is possible to access a call server which controls Voice over Internet Protocol (VoIP) calls; a recording interface processor for, when it is possible to access the call server, setting a connection to a recording server; a recorder for generating recording data packets comprising a cellular phone conversation; and a data communicator for transmitting the recording data packets to the recording server.

Abstract: A communication system, an apparatus, and a method for providing a call state thereof are provided. The method for providing a call state of a communication system, supporting communication over a mobile communication network and an interne network, includes, when presence of mobile call execution changes through a base transceiver station over the mobile communication network, notifying the presence of mobile call execution to an Instant Messaging/Presence Service (IM/PS) server managing presence of interne call execution over the interne network by a User Equipment (UE), and sending the presence of mobile call execution to another UE by the IM/PS server.

Abstract: An apparatus and method for automatically mirroring Real Time Protocol (RTP) packets in a Voice over Internet Protocol (VoIP) system including an Internet Protocol-Private Branch Exchange (IP-PBX). It is possible automatically detects call startup and/or termination from an RTP packet or an RTP Control Protocol (RTCP) packet provided through a mirroring port of the IP-PBX, and based on the detection of call startup and/or termination, automatically mirrors the RTP/RTCP packet, which is transmitted/received due to call establishment.

Abstract: A communication system, an apparatus, and a method for providing a call state thereof are provided. The method for providing a call state of a communication system, supporting communication over a mobile communication network and an internet network, includes, when presence of moving call execution changes through a base transceiver station over the mobile communication network, notifying the presence of moving call execution to an Instant Messaging/Presence Service (IM/PS) server managing presence of internet call execution over the internet network by a User Equipment (UE), and sending the presence of moving call execution to another UE by the IM/PS server.

Abstract: Call recording in an Internet telephone system is provided. A dual-mode terminal includes a call server interworker for, when a cellular call commences, determining whether it is possible to access a call server which controls Voice over Internet Protocol (VoIP) calls; a recording interface processor for, when it is possible to access the call server, setting a connection to a recording server; a recorder for generating recording data packets comprising a cellular phone conversation; and a data communicator for transmitting the recording data packets to the recording server.

Abstract: An apparatus and method for automatically mirroring Real Time Protocol (RTP) packets in a Voice over Internet Protocol (VoIP) system including an Internet Protocol-Private Branch Exchange (IP-PBX). It is possible automatically detects call startup and/or termination from an RTP packet or an RTP Control Protocol (RTCP) packet provided through a mirroring port of the IP-PBX, and based on the detection of call startup and/or termination, automatically mirrors the RTP/RTCP packet, which is transmitted/received due to call establishment.