IP telephone apparatus, ENUM server, terminal apparatus and...
IP telephone device
IP telephone system
IP telephone system and calling method
IP telephone system and calling method
IP telephone system having a hold function and a callback...
IP telephone system, IP telephone apparatus and calling method
IP telephone system, IP telephone apparatus and method for...
IP telephone system, IP telephone apparatus and method for...
IP telephony apparatus providing simultaneous SIP...
IP telephony gateway—solution for telecom switches
IP telephony network using a configuration map for...
IP telephony network using a configuration map for...
IP telephony system, VoIP terminal, and method and program...
IP telephony transport
IP Time to Live (TTL) field used as a covert channel
IP voice call surveillance through use of non-dedicated IP...
IP voice call surveillance through use of non-dedicated IP...
IP-based base station system
IP-based enhanced emergency services using intelligent...