Patent ID: 8488591
Filing Date: 2013-07-16
Classification: H04L,H04M

Abstract:
1. A method of setting up a video telephone call between a first video telephone terminal and a second video telephone terminal, comprising the steps of: establishing a telephone call over a circuit-switched network between said first terminal and said second terminal; seeking, during said telephone call, availability of said first and second terminals to hold a video telephone call therebetween; if said availability is confirmed, releasing said telephone call between said first and second terminals; and establishing, upon release of said telephone call, a video telephone call between said first and second terminals over a packet-switched network, wherein at least one of said first and second terminals alternatively connects to the circuit-switched network or to the packet-switched network, such that the terminal may not be concurrently connected with both the circuit-switched network and the packet-switched network, wherein, after releasing said telephone call and before establishing a video telephone call, the method further comprising the step of establishing respective telephone calls between said first and second terminals and corresponding access servers of said packet-switched network, for achieving connection of said first and second terminals to said packet-switched network, wherein, after establishing respective telephone calls between said first and second terminals and corresponding access servers and before establishing a video telephone call, the method further comprising establishing a signalling exchange between said first and second terminals through a service center of said packet-switched network to achieve the video telephone call.