Patent ID: 9264290
Filing Date: 2016-02-16
CPC Classification: H04L,H04M

Claim Text:
1. A method for processing call, the method comprising: reading an “is internal” flag in a second field in the data structure associated with a private identifier to determine if one of a plurality of user equipment devices associated with the private identifier is at a registered location associated with a particular network access device on which the plurality of user equipment devices are registered; sending an invitation to register to the one of the plurality of user equipment devices if the one of the plurality of user equipment devices is not registered; receiving a register message from the one of the plurality of user equipment devices and registering the one of the plurality of user equipment devices; comparing a voice over internet protocol access port internet protocol address with an internet protocol address for the private identifier to determine if the voice over internet protocol access port is at the registered location; and returning a call back number for the voice over internet protocol access port when the voice over internet protocol access port is at the if the user equipment device is at the visiting location, comparing a voice of internet protocol access port internet protocol address for the visiting location with a public internet protocol address in the data structure for the private identifier, to determine if the voice over internet protocol access port is at the registered location.