Patent ID: 7609685

Claim:
A method of providing simultaneous communication for multiple IP phones, the method comprising the steps of: (a) providing an IP telephony apparatus using an SIP protocol and a local SIP number; (b) connecting the IP telephony apparatus to a network and a plurality of telephone sets; (c) dialing a remote SIP number with at least one telephone set; (d) finding a local SIP number for communication with the remote SIP number by a mapped policy means; (e) examining whether an SIP control block is present; (f) creating at least one SIP control block containing an SIP call-leg for the local SIP number if the SIP control block is not present; and (g) allocating the SIP control block to the dialing telephone set according to the SIP call-leg and establishing a bi-directional digital voice packet transmission between the dialing telephone set and the remote SIP number if the SIP control block is present.