Geographically redundant and multiple eatf nodes

Abstract

An emergency access transfer function (EATF) node is described for use when hand over of a user equipment (UE) from a first to a second access network is performed during an emergency call session (ECS). The EATF node receives a request for transferring the ECS from the first access network to the second access network. The EATF node transfers the ECS of the UE from the first to the second access network when the ECS is known to the EATF node. The EATF node selects a second EATF node from a set of one or more EATF nodes when the ECS is unknown, and forwards the request for transferring the ECS to the second EATF node. The EATF node may be in a first network region and the second EATF node may be in the first or a second network region.

Dependencies are inferred from the claim text.