Operating and supporting dual mode user equipment

摘要

A call to a dual mode user equipment is handled by using a further access network from cellular telecommunications access network. An indication of an incoming call to the user equipment is received in a control node that the device can be reached via a device using session initiation protocol (SIP) via the cellular telecommunication access network. The device using SIP sends messages to a device that transforms messages sent according to call control signaling protocol used in the cellular telecommunications network into messages according to SIP. A route to the SIP device is linked to a device that transforms user plane according to protocol in the cellular telecommunications access network into user plane according to internet protocol and vice versa.

主权项

1. A method for handling an incoming call to a user equipment by a control node of a cellular telecommunication access network, said method comprising the following steps:
receiving in the control node an indication of an incoming call to the user equipment, wherein the user equipment is connected to the cellular telecommunication access network, receiving in the control node an indication communicated wirelessly by the user equipment to the cellular telecommunication access network, wherein the indication indicates that the user equipment is connected by a further access network to a device operating according to a session initiation protocol, and wherein the cellular telecommunication access network rather than the further access network initially receives the indication of the incoming call to the user equipment, initiating in the control node the linking in on a route towards the device operating according to a session initiation protocol, of a device that transforms messages sent according to a call control signaling protocol used in the cellular telecommunications access network into messages according to the session initiation protocol, initiating in the control node the linking in on a route towards the device operating according to a session initiation protocol, of a device that transforms user plane transmitted according to a protocol used in the cellular telecommunications access network into user plane transmitted according to an internet protocol and vice versa; and wherein the control node by performing the first initiating step and the second initiating step provides the incoming call to the user equipment using the device operating according to the session initiation protocol rather than using a wireless radio connection.