Samsung Electronics Co., Ltd.

Si-Baek Kim

Dae-Hyun Lee

Eung-Moon Yeom

An apparatus and a method for determining a state of a counterpart without executing a separate program executed in order to determine a current state of the counterpart in a communication apparatus are provided. The apparatus includes a state information server and a communication apparatus. When receiving state information, the state information server provides the received state information to a user who has registered the communication apparatus that has provided the state information. When receiving state information from the state information server, the communication apparatus outputs the user's state information corresponding to the state information.

Apparatus and method for providing presence service in communication device

In a system and method for providing Push To Talk (PTT) service according to a state of the user, when a PTT terminal user is absent, in conference or busy, the PTT system converts the PTT voice message directed to the PTT terminal to a text message, and displays it on a screen of another terminal or the PTT terminal. As a result, the user can immediately check the PTT message when he/she is in absence or conference state, and is busy without communication interference.

System and method for providing PTT service according to user state

A network system for recovering from a link failure in a Voice over Internet Protocol (VoIP) service comprises: a first media gateway having a current link setting and transmitting a corresponding packet upwardly for the VoIP service; a second media gateway which is link-connected to the same remote terminal as the first media gateway for the VoIP service; a media gateway controller for allocating the second media gateway for link resetting, and for transmitting allocation information when receiving failure information of a link set through the first media gateway; and a router for determining whether a packet transmitted from the first media gateway is received within a set time to determine whether there is a failure of the set link, for transmitting the link failure information to the media gateway controller, and for resetting the link to the second media gateway according to the allocation information transmitted from the media gateway controller when there is a link failure. A method for recovering from a link failure in a VoIP serviced comprises steps corresponding to the aforementioned functions.

Network system and method for link failure recovery

In a symmetric network address translation system using a Simple Traversal of UDP over NAT (STUN) technique and a method for implementing the same, a voice over Internet protocol (VoIP) network includes a STUN server for transmitting, to a private network terminal, a public Internet Protocol (IP) address and first port information of a router which is used for a VoIP call. The private network terminal transmits a session setup request message, including the public IP address and the first port information of the router, through its private IP address and a second port, and the router maps and stores the public IP address and the first port information of the router, and the private IP address and the second port of the private network terminal, and routes a packet received through the public IP address and the first port to the private IP address and the second port. Thus, a VoIP call is performed using the symmetric network address translation system to which the STUN technique is applied.

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Suwon-si, South Korea

Si-Baek Kim