Scheme to relocate H. 323 gatekeeper during a call when endpoint changes its zone

A computer program stored on a storage medium readable by a computer for allowing endpoints to move between different zones of a packet-switched network, said computer program when executed causes the computer to perform the steps of:

• establishing a communication between local and remote endpoints via a first gatekeeper, which services a first zone of the packet-switched network, when said local endpoint is at a location serviced by said first zone of the packet-switched network;
• and
• maintaining communication between said local and remote endpoints via said first gatekeeper and a second gatekeeper, which services a second zone of the packet-switched network, when said local endpoint moves to a location serviced by said second zone of the packet-switched network;
• and
• further maintaining communication between said local and remote endpoints via said first gatekeeper and a third gatekeeper, which services a third zone of the packet-switched network, when said local endpoint moves to a location serviced by said third zone of the packet-switched network,
• wherein said further maintaining comprises handing-off communication control functions from said second gatekeeper to said third gatekeeper, when said local endpoint moves to said third zone of said packet-switched network serviced by said third gatekeeper, relaying, by said first gatekeeper, communications between said remote endpoint and said third gatekeeper, relaying, by said third gatekeeper, communications between said first gatekeeper and said local endpoint;
• and performing, by said third gatekeeper, communication control functions, previously performed by said second gatekeeper, on communications between said local and remote endpoints.