Method for collect call service based on voip technology and system thereof

A collect call system based on voice over Internet protocol (VoIP), comprising:

• a called gateway configured to receive a collect call request from a caller terminal via a VoIP network compatible with one of H.323 Protocol, Session Initiation Protocol (SIP), or Media Gateway Control Protocol (MGCP);
• and
• a collect call switch configured to:
• a) establish a first communication link between the collect call switch the called gateway upon receiving a collect call request from the caller terminal;
• b) subsequent to establishing the first communication link, establish a second communication link between the collect call switch and a called terminal;
• c) transmit a caller identification to the called terminal when the second communication link is established;
• and
• d) connect the first communication link and the second communication link based on a collect call acceptance from the called terminal to establish a voice call link between the caller terminal and called terminal;
• wherein the collect call switch is further configured to determine a collect call toll only for the second communication link and to initiate a billing process responsive to the collect call acceptance.