Patent ID: 8842686

Claim:
A communication system comprising a relay server assigned to a wide area Internet Protocol (hereinafter IP) network and having a Session Initiation Protocol (hereinafter SIP) function, a transmitting terminal transmitting over the relay server, and a receiving terminal receiving over the relay server; the transmitting terminal and the receiving terminal having a first IP address for communicating over the wide area IP network and a second IP address for communicating directly, without passing through the wide area IP network, over a short circuit in an Internet network using eXtensible Messaging and Presence Protocol (hereinafter XMPP) as a communication protocol; in which: the transmitting terminal switches to the short circuit and communicates after communication with the receiving terminal is established over the wide area IP network; the wide area IP network comprises a control circuit and a data circuit; and the transmitting terminal sends SIP control data over the control circuit and XMPP control data over the data circuit.