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Operating And Supporting Dual Mode User Equipment

  • US 20070207784A1
  • Filed: 09/28/2004
  • Published: 09/06/2007
  • Est. Priority Date: 09/28/2004
  • Status: Active Grant
First Claim
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1. A method for handling an incoming call to a user equipment by a control node of a cellular telecommunication network, said method comprising the following steps:

  • receiving an indication of an incoming call to the user equipment in the control node, determining that the called user equipment can be reached via a device of a further access network operating according to a session initiation protocol. initiating 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 network into messages according to the session initiation protocol, and initiating 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 network into user plane transmitted according to an internet protocol and vice versa.

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