Abstract: A method for establishing a video conference is provided. The method is applied in a video conferencing system. The system has a first electronic device, a second electronic device, a third electronic device, a fourth electronic device, and a server. The first and second electronic devices are associated with a first user. The third and fourth electronic devices are associated with a second user. The method is capable of building an audio communication between the first electronic device and the third electronic device over a telecommunications network; and building a video communication between the second electronic device and the fourth electronic device over an IP network simultaneously, wherein the video communication is parallel to the audio communication.

Abstract: A method for establishing a video conference is provided. The method is applied in a video conferencing system. The system has a first electronic device, a second electronic device, a third electronic device, a fourth electronic device, and a server. The first and second electronic devices are associated with a first user. The third and fourth electronic devices are associated with a second user. The method is capable of building an audio communication between the first electronic device and the third electronic device over a telecommunications network; and building a video communication between the second electronic device and the fourth electronic device over an IP network simultaneously, wherein the video communication is parallel to the audio communication.

Abstract: Connection establishing management methods for traversing network address translation (NAT) routers and firewalls between network terminal devices to establish a connection channel therebetween for use in a network system including at least first, second and third network terminal devices and a traversal server are disclosed. First, when traversal server receives a call request of first and second network terminal devices, network topology levels of first and second network terminal devices are detected to detect whether first and second network terminal devices are located behind NAT router and/or firewall. Then, one of first and second network terminal devices or third network terminal device is selected according to the detection result such that selected network terminal device acted as proxy server for the traversal server to establish a connection channel corresponding to call request between first and second network terminal devices.

Abstract: Connection establishing management methods for traversing network address translation (NAT) routers and firewalls between network terminal devices to establish a connection channel therebetween for use in a network system including at least first, second and third network terminal devices and a traversal server are disclosed. First, when traversal server receives a call request of first and second network terminal devices, network topology levels of first and second network terminal devices are detected to detect whether first and second network terminal devices are located behind NAT router and/or firewall. Then, one of first and second network terminal devices or third network terminal device is selected according to the detection result such that selected network terminal device acted as proxy server for the traversal server to establish a connection channel corresponding to call request between first and second network terminal devices.

Abstract: Data management methods for use in a network system including at least first, second and third network terminal devices and traversal server are disclosed. First and second network terminal devices can traverse at least one NAT router and/or firewall to establish a connection channel between each other for data access through traversal server. The method includes the steps of: receiving first packet with first protocol format from first network terminal device; determining whether to perform protocol conversion operation; if so, obtaining a list of available network terminal devices, assigning first network terminal device from obtained list, converting first packet with first protocol format into second packet with second protocol format that is decodable by second network terminal device, and sending second packet to second network terminal device such that second network terminal device can obtain content of first packet by decoding second packet upon reception of second packet.