A method and apparatus for facilitating handoff for a mobile entity in a wireless communication network is provided (100). The method comprising obtaining a first internet protocol (IP) address for the mobile entity (105) when the mobile entity is attached to a first access node, identifying at least one target access node (110), the target access node being a potential access node for handoff for the mobile entity, sending a trigger message corresponding to the mobile entity to the identified target access node (115) and acquiring a second IP addresses for the mobile entity at the target access node (120). The invention also proposes a method for creating a tunnel for facilitating the handoff for a mobile entity from the first access node to the target access node (205, 210, 215, 220).

 
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> UMTS telecommunications system for enabling a mobile station to receive voice-over internet protocol calls when roaming

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