A wireless communication unit (101, 200), network switch (112, 300) and corresponding methods facilitate routing and handover or handin of calls from a second network (105) to a first network (103) when the unit has been operating in second network and is being handed in to the first network. The communication...http://www.google.fr/patents/US7031280?utm_source=gb-gplus-shareBrevet US7031280 - Method and apparatus for hand over of calls
