US 8,542,670 B2 · Inter-domain call routing

Abstract

The present invention provides for routing calls between disparate domains, such as a circuit-switched subsystem and a multimedia subsystem. When a user element is homed in a first domain and roaming in a second domain, an incoming call will arrive at a gateway node in the first domain. As a result, a message identifying the user element and indicating that an incoming call has been received at first gateway node for the first domain is sent to a continuity control function (CCF) residing in the multimedia subsystem. The CCF will create and effect delivery of an inter-domain routing number to the first gateway node. The inter-domain routing number is used by the first gateway node to route the call to the second domain. The inter-domain routing number may be associated with a second gateway node of the second domain.

Claims28

Dependent claims

A method for routing a call for a user element having a directory number from a first domain into a second domain, wherein the user element is homed in the first domain and roaming in the second domain, comprising:

receiving a first message identifying the user element and indicating that an incoming call intended for the user element has been routed to a first gateway node for the first domain;
temporarily assigning a temporary inter-domain routing number for the incoming call intended for the user element;
and
providing the temporary inter-domain routing number for the first gateway node to use to route the incoming call into the second domain, wherein one of the first and second domains is a circuit-switched subsystem and another of the first and second domains is a multimedia subsystem,
wherein the temporary inter-domain routing number identifies a second gateway node for the second domain, such that the incoming call is routed from the first gateway node of the first domain to the second gateway node of the second domain using the temporary inter-domain routing number and the temporary inter-domain routing number is released after routing the incoming call.

2 more elements

A service node for routing a call for a user element having a directory number from a first domain into a second domain, wherein the user element is homed in the first domain and roaming in the second domain, comprising:

a communication interface;
and
a control system associated with the communication interface and adapted to:
receive a first message identifying the user element and indicating that an incoming call intended for the user element has been routed to a first gateway node for the first domain;
temporarily assign a temporary inter-domain routing number for the incoming call intended for the user element;
and
provide the temporary inter-domain routing number for the first gateway node to use to route the incoming call into the second domain, wherein one of the first and second domains is a circuit-switched subsystem and another of the first and second domains is a multimedia subsystem,
wherein the temporary inter-domain routing number identifies a second gateway node for the second domain, such that the incoming call is routed from the first gateway node of the first domain to the second gateway node of the second domain using the temporary inter-domain routing number and the temporary inter-domain routing number is released after routing the incoming call.

5 more elements

Dependencies are inferred from the claim text.

Inter-domain call routing

Life of this patent

Inter-domain call routing

Life of this patent

Abstract

Claims28