Patent ID: 7561512
Filing Date: 2009-07-14
Classification: H04L

Abstract:
1. A method for crankback handling in a multi-peer group network, comprising: receiving, at a first node of a succeeding peer group a first connection request from a first node of a preceding peer group; detecting a call failure occurring between nodes within the succeeding peer group, the detected call failure occurring at a location inside the succeeding peer group wherein the succeeding peer group is a different peer group from the preceding peer group; determining whether multiple nodes in the succeeding peer group have connectivity to the preceding peer group; determining whether multiple nodes of the preceding peer group have connectivity to the first node of the succeeding peer group; transmitting a succeeding end crankback rather than a next higher level crankback from the succeeding peer group to the preceding peer group if multiple nodes in the succeeding peer group have connectivity to the preceding peer group and multiple nodes of the preceding peer group do not have connectivity to the first node of the succeeding peer group; wherein the succeeding end crankback specifies a blocked interface at a first link between the preceding peer group and the succeeding peer group; wherein the first link is located outside the preceding peer group and located outside of the succeeding peer group; and wherein the succeeding end crankback is transmitted from the first node of the succeeding peer group; receiving a second connection request from the preceding peer group, the second connection request using a second link to the succeeding peer group that avoids the call failure; wherein the second link is between the first node of the first peer group and a second node of the second peer group or a second node of the preceding peer group and the second node of the second peer group.