Device and method for providing mobile internet call service

[0040]The control unit 300 has different control operations according to two embodiments. First, control operations for the mVoIP call service will be described.

[0041]The control unit 300 according to the first embodiment performs a signaling process of sending a signal for acquiring NAT information of the main call numbers that are predetermined by the user when power of the terminal 200 is initially turned on. In this case, signaling may include an SIP, an XMPP, or a third party protocol. In addition, the control unit 300 checks whether NAT information of the incoming terminal 210 is present in the NAT & SIP signaling system 130 having NAT information of a plurality of terminals. When corresponding NAT information may not be transmitted to the terminal 200, the control unit 300 sends signaling of NAT information to the incoming terminal 210 and the incoming terminal 210 transmits only a response signal therefor.

[0042]Then, the control unit 300 stores the acquired NAT information of

[0043]When there is call originating for an mVoIP call, the control unit 300 determines whether a calling number is an initial call request. When the calling number is a number of an initial call request, the control unit 300 performs control such that the NAT information acquisition and the SIP signaling process are performed, the acquired NAT information is used to attempt a P2P call connection to the incoming terminal, and the acquired NAT information is not deleted but stored in the storage unit 308, and may be used for call originating for an mVoIP call that is generated later. On the other hand, when the calling number is not a number of an initial call request, the control unit 300 performs control such that stored NAT information is used to attempt a P2P call connection to the incoming terminal.

[0044]As described above, a state in which the NAT information is stored in advance and a session for a call connection is maintained in order to reduce a waiting time for a call connec