Routing service method in voice over internet protocol system
First Claim
1. A routing service method in a Voice over Internet Protocol (VoIP) system using a stand-alone gateway interworking with a Public Switch Telephone Network (PSTN), comprising the steps of:
- receiving a call service request over an incoming trunk from a calling private branch exchange (PBX) connected via the PSTN;
determining in the stand-alone gateway whether a call service can be provided over an Internet using an internal database in response to the call service request from the calling PBX; and
using a PSTN access code for rerouting a call in response to a service request and transmitting the call to the calling PBX via a roundabout outgoing trunk used with the incoming trunk in the stand-alone gateway when it is determined that the call service cannot be provided over the Internet.
1 Assignment
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Accused Products
Abstract
A routing service method in a public switched telephone network (PSTN) system uses a stand-alone gateway interworking with disparate central office lines. The stand-alone gateway checks whether a call service can be provided over the Internet with reference to an internal database having periodically updated call service state information in response to a call service request from a calling private branch exchange (PBX) connected to the stand-alone gateway via a central office line. If the call service cannot be provided over the Internet, the stand-alone gateway transmits a call service request, together with a public switched telephone network (PSTN) rerouting control request, to the calling PBX. The calling PBX transfers the call to a called party over the PSTN in response to the PSTN rerouting control request.
28 Citations
25 Claims
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1. A routing service method in a Voice over Internet Protocol (VoIP) system using a stand-alone gateway interworking with a Public Switch Telephone Network (PSTN), comprising the steps of:
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receiving a call service request over an incoming trunk from a calling private branch exchange (PBX) connected via the PSTN; determining in the stand-alone gateway whether a call service can be provided over an Internet using an internal database in response to the call service request from the calling PBX; and using a PSTN access code for rerouting a call in response to a service request and transmitting the call to the calling PBX via a roundabout outgoing trunk used with the incoming trunk in the stand-alone gateway when it is determined that the call service cannot be provided over the Internet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A routing service method in a Voice over Internet Protocol (VoIP) system with reference to a stand-alone gateway interworking with a Public Switched Telephone Network (PSTN), comprising the steps of:
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receiving a call service request over an incoming trunk from a calling private branch exchange (PBX) connected via the PSTN; accessing a database including a remote gateway Internet Protocol (IP) table, a remote gateway access code table and a remote gateway state table in a stand-alone gateway in response to the call service request from the calling PBX; determining in the stand-alone gateway whether a call service can be provided over an Internet by using the remote gateway state table of the database in response to the call service request from the calling PBX; and using a PSTN access code for rerouting a call in response to the call service request, and transmitting the call to the calling PBX via a roundabout outgoing trunk used with an incoming trunk in the stand-alone gateway when it is determined that the call service cannot be provided over the Internet.
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14. A routing service method in a Voice over Internet Protocol (VoIP) system using stand-alone gateways interworking with disparate central office lines, comprising the steps of:
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providing a database, which includes an access code table, an Internet protocol (IP) table, and a state table for remote gateways, and a Public Switched Telephone Network (PSTN) rerouting setting field, to a local-stand alone gateway; updating the state table for remote gateways by periodically testing links between the local stand-alone gateway and remote stand-alone gateways; determining whether a call service over an Internet is available with reference to the state table for remote gateways by means of the local stand-alone gateway upon receipt of a call service request from a calling PBX connected to the local stand-alone gateway via a central office line; inserting a PSTN central office line access code set in the PSTN rerouting setting field in the call service request, and transmitting the call service request with the PSTN central office line access code to the calling PBX, when the call service over the Internet is not available; and requesting call service to the PSTN using the PSTN central office line access code by means of the calling PBX.
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15. A Voice over Internet Protocol (VoIP) system for providing a routing service, comprising:
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a stand-alone gateway interworking with disparate central office lines; determining means in the stand-alone gateway for determining whether a call service can be provided over an Internet by accessing a database of a remote gateway in the stand-alone gateway in response to a call service request from a calling private branch exchange (PBX); means for using a Public Switched Telephone Network (PSTN) access code for rerouting a call in response to the call service request; and transmitting means in the stand-alone gateway for transmitting the call to the calling PBX via an incoming trunk used for the call service request in an internal database when it is determined that the call service cannot be provided over the Internet. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A Voice over Internet Protocol (VoIP) system which provides a routing service, said system comprising:
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stand-alone gateways interworking with disparate central office lines; a database which includes an access code table, an Internet protocol table, and a state table for remote gateways, and a Public Switched Telephone Network (PSTN) rerouting setting field, said state table for remote gateways being updated periodically by testing links between a local stand-alone gateway and remote stand-alone gateways; determining means for determining whether a call service over an Internet is available with reference to the state table for remote gateways by means of the local stand-alone gateway upon receipt of a call service request from a calling private branch exchange (PBX) connected to the local stand-alone gateway via a central office line; inserting means for inserting a PSTN central office line access code, set in the PSTN rerouting setting field, in the call service request; transmitting means for transmitting the call service request with the PSTN central office line access code to the calling PBX when the call service over the Internet is not available; and requesting means in the calling PBX for requesting call service to the PSTN using the PSTN central office line access code.
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Specification