Patent ID: 7782879

Claim:
A method of call set up between first and second network call controllers in a first layer comprising: a) Establishing a call between said first and second network call controllers via a plurality of network call controllers in a second layer; and b) Generating an ordered list of network call controllers in said first layer which provide a signaling path between said first and second network controllers; wherein step (b) comprises: i) Generating an ordered list of first layer network call controllers at said second layer in response to said establishing step; and ii) Communicating said ordered list to aid first network call controller for establishing signaling between said first and second network call controllers in said first layer; wherein hops in said signaling path can cross different signaling control networks (SCNs) and wherein said ordered list of network call controllers in said first layer are associated with said plurality of network call controllers in said second layer by means of associations between at least 2 pairs of call controllers, where each pair consists of a call controller from the first layer and one from the second layer.