Patent ID: 9148288
Filing Date: 2015-09-29
Classification: H04L,H04M

Abstract:
1. A method of providing a telecommunication service to a subscriber of a telecommunication system wherein the subscriber has a plurality of associated telecommunication devices including a first device and a second device, each of said plurality of associated telecommunication devices is contactable via a device-shared identification address, the first device is capable of communicating with a telecommunications network, and the second device is capable of communicating with a packet-switched network and further capable of communicating with a circuit-switched network, the method comprising: a control system receiving an incoming telecommunication request associated with an incoming telecommunication request directed to the device-shared identification address for the subscriber, the incoming telecommunication request having been routed to the control system on the basis of the device-shared identification address; the control system initiating a first control phase, and in said first control phase: the control system transmitting a first outgoing telecommunication request over the telecommunications network to the first device using Session Initiation Protocol as a signaling protocol, and while the packet-switched network and the circuit-switched network are both available for communication with the second device, the control system performing an operation to at least attempt to transmit a second outgoing telecommunication request over the packet-switched network to the second device using Session Initiation Protocol as a signaling protocol, in preference to transmitting an outgoing telecommunication request over the circuit-switched network to the second device; and if the operation to at least attempt to transmit the second outgoing telecommunication request over the packet-switched network to the second device is deemed to be unsuccessful, the control system initiating a second control phase, and in said second control phase the control system transmitting a third outgoing telecommunication request over the circuit-switched network to the second device.