US 7,068,646 B2Granted

System and method for performing IP telephony including internal and external call sessions

AssigneeVoxpath Networks, Inc.

InventorsRichard E. Fangman, Jason D. Preston

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Abstract

System and method for IP telephony including internal and external call sessions. The system includes at least one IP telephone (IPT), a Service Gateway (SG), and a Media Gateway Controller (MGC). The SG receives a Call Setup request, including a source IP address and a destination telephone number. A first Media Gateway is selected based on the source IP address. A second Media Gateway is selected based on the destination telephone number. A public IP address of the first Media Gateway is compared to a public IP address of the second Media Gateway, and if the same, respective private IP addresses of the first and second Media Gateway are selected for Call Setup. If different, the respective public IP addresses of the first and second Media Gateway are selected for Call Setup. Thus, the system and method distinguish between external and internal call sessions and route the IP traffic accordingly.

Claims18

Dependent claims

A method for performing IP telephony, comprising:

registering a first Media Gateway with a Media Gateway Controller, wherein said registering the first Media Gateway comprises receiving and storing the public IP address of the first Media Gateway;
registering a second Media Gateway with the Media Gateway Controller, wherein said registering the second Media Gateway comprises receiving and storing the public IP address of the second Media Gateway;
the Media Gateway Controller receiving a Call Setup request, wherein the Call Setup request comprises a source IP address and a destination telephone number;
the Media Gateway Controller selecting the first Media Gateway based on the source IP address;
the Media Gateway Controller selecting the second Media Gateway based on the destination telephone number;
the Media Gateway Controller comparing a public IP address of the first Media Gateway to a public IP address of the second Media Gateway;
if the public IP address of the first Media Gateway is the same as the public IP address of the second Media Gateway, the Media Gateway Controller selecting a private IP address of the first Media Gateway and a private IP address of the second Media Gateway for Call Setup;
and
if the public IP address of the first Media Gateway is not the same as the public IP address of the second Media Gateway, the Media Gateway Controller selecting the public IP address of the first Media Gateway and the public IP address of the second Media Gateway for Call Setup.

6 more elements

A system for performing IP telephony, comprising:

a network;
a first Media Gateway;
a second Media Gateway, wherein the second Media Gateway is operable to couple to the first Media Gateway through the network;
and
a Media Gateway Controller, wherein the Media Gateway Controller is operable to couple to the first Media Gateway and the second Media Gateway through the network;
wherein the Media Gateway Controller is operable to:
register the first Media Gateway, wherein, in registering the first Media Gateway the Media Gateway Controller is operable to receive and store the public IP address of the first Media Gateway;
and
register the second Media Gateway, wherein, in registering the second Media Gateway the Media Gateway Controller is operable to receive and store the public IP address of the second Media Gateway;
wherein the first Media Gateway is operable to send a Call Setup request to the Media Gateway Controller, wherein the Call Setup request comprises a source IP address and a destination telephone number;
wherein the Media Gateway Controller is operable to:
receive a Call Setup request;
select the first Media Gateway based on the source IP address;
select the second Media Gateway based on the destination telephone number;
compare a public IP address of the first Media Gateway to a public IP address of the second Media Gateway;
if the public IP address of the first Media Gateway is the same as the public IP address of the second Media Gateway, select a private IP address of the first Media Gateway and a private IP address of the second Media Gateway for Call Setup;
and
if the public IP address of the first Media Gateway is not the same as the public IP address of the second Media Gateway, select the public IP address of the first Media Gateway and the public IP address of the second Media Gateway for Call Setup.

15 more elements

A memory medium, wherein the memory medium stores program instructions which are executable to perform:

registering a first Media Gateway, wherein said registering the first Media Gateway comprises receiving and storing the public IP address of the first Media Gateway;
registering a second Media Gateway with the Media Gateway Controller, wherein said registering the second Media Gateway comprises receiving and storing the public IP address of the second Media Gateway;
receiving a Call Setup request, wherein the Call Setup request comprises a source IP address and a destination telephone number;
selecting the first Media Gateway based on the source IP address;
selecting the second Media Gateway based on the destination telephone number;
comparing a public IP address of the first Media Gateway to a public IP address of the second Media Gateway;
if the public IP address of the first Media Gateway is the same as the public IP address of the second Media Gateway, selecting a private IP address of the first Media Gateway and a private IP address of the second Media Gateway for Call Setup;
and
if the public IP address of the first Media Gateway is not the same as the public IP address of the second Media Gateway, selecting the public IP address of the first Media Gateway and the public IP address of the second Media Gateway for Call Setup.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/903,822Filed 11 Jul 2001 · us provisional application
Priority: 3 Apr 2001
Published: US 2002/0150083 A117 Oct 2002
Granted: 27 Jun 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H04L 63/0272
For separating internal from external traffic, e.g. firewalls: virtual private networks
H04L 61/00
Network arrangements, protocols or services for addressing or naming
H04L 61/2514
Translation of Internet protocol [IP] addresses: between local and global IP addresses
H04L 61/2517
Translation of Internet protocol [IP] addresses: using port numbers