A communication terminal apparatus wherein even if there occurs a dropout or overtaking of
call control messages, the current service can be continued without increasing the load of an …

There are provided a communication System where foreign kinds of networks are mixed
Such as a wireleSS LAN and a mobile phone System, wherein the hand-over of a commu …

A gateway unit which relays communication between a call control network and a terminal
having no call control func tion. The gateway unit includes: a session control section which …

A dual communication system comprises a cellular communication terminal 1 having a
plurality of communication means. The cellular communication terminal 1 is provided with a …

A communication terminal unit has a system control section including a communication error
detection section that detects a communication error, which occurs at the time of originating …

A mobile communication terminal apparatus and a control method thereof wherein a smooth
handoff can be quickly achieved in a seamless manner during a roaming between data …

US20040013247A1 - Internal information sharing system, call connection control server, wireless
LAN telephone terminal apparatus and internal information sharing method thereof - Google …

A mobile communication terminal is provided. A storage unit stores a disconnect cause
associated with caller information. A communication unit receives an incoming call. A …

A communication terminal apparatus wherein a network-led handover and a communication
terminal apparatus-led handover are simultaneously performed, whereby even if the link …

A communication apparatus and a communication control method are provided that make it
possible to easily relocate communication apparatus while the continuity of a service a …