Intranet voice over data operator service
IP ACD using SIP format
IP based telephone system
IP communication method, IP terminal apparatus, ENUM server...
IP COMMUNICATION NETWORK SYSTEM HAVING A GATEWAY FUNCTION...
IP gateway apparatus
IP inter-working gateway in next generation network and...
IP packet switching in a Telco switch
IP phone device capable of remote controlling associated PC...
IP phone system and IP phone terminal registration method
IP switch, interface circuit and ATM switch used for IP...
IP telecommunications
IP telephone and IP telephone call method
IP telephone apparatus
IP telephone apparatus and system having automatic registration
IP telephone apparatus, ENUM server, and calling method via...
IP telephone apparatus, ENUM server, terminal apparatus and...
IP telephone device
IP telephone system and calling method
IP telephone system and calling method