| 摘要 |
PURPOSE: A call control method guaranteeing call connection quality using remote call back in a wireless VoIP terminal is provided to resolve a call connection quality issue using a dual mode VoIP terminal including a wireless VoIP and a CDMA telephone. CONSTITUTION: If a mobile keeper and a TCP/IP link are normally connected, a wireless VoIP activates a wireless VoIP mode(S14,S15). The wireless VoIP terminal transmits a designation request about a CDMA telephone number of the wireless VoIP terminal with a remote call back number to the mobile keeper though the TCP/IP link(S16). The mobile keeper requests setup about the CDMA telephone number of the wireless VoIP terminal to a VoIP switch with the remote call back number(S17). The mobile keeper transfers a remote call back activation request to the VoIP switch(S19). The VoIP switch calls a CDMA telephone call to the requested remote call back number(S20). A dual mode wireless VoIP terminal receiving the CDMA call from the VoIP switch intercepts and automatically responses the CDMA call(S21) and transfers a response signal to the VoIP switch(S22). The VoIP switch calls an analog phone when receiving the response signal(S23). If the opponent telephone responses, the VoIP switch receives the response signal(S24) and connects a call with the VoIP terminal. If the wireless VoIP terminal disconnects a call, Cellular Call Release is informed to the VoIP(S25). [Reference numerals] (10) Analog phone; (13) VoIP switch; (16) Wireless VoIP phone; (18) CDMA switch(Mobile); (AA) Sending attempt; (BB) Request remote call back(CDMA phone number of a wireless VoIP terminal); (CC) Request a remote call back service(providing a return call); (DD) Response; (EE) Input a receipt number of an opponent; (FF) Request receipt to the remote call number; (GG) Release; (S11) WiFi or Network is normal?; (S12) Perform a normal call process; (S13) Request TCP/IP connection; (S14) TCP/IP connection result; (S15) Switch to(Activate) a wireless VoIP mode; (S17) Request setting of remote call back; (S19) Request activation of remote call back; (S20) Request receipt to a remote call number(User's CDMA number); (S21) Intercept a received CDMA call and automatically respond; (S23) Call a called subscriber
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