Method and apparatus for telephone routing between PTN and PSTN
First Claim
1. A method for telephone routing between a private telephone network (PTN) and a public switched telephone network (PSTN), said method is applicable to an interface apparatus between said PSTN and said PTN, said interface apparatus connects to a least one PSTN by using a plurality of external lines, and also connects to a plurality of telephony devices via an intranet, when a PTN user make a call to a PSTN user, said telephone routing method comprises the steps of:
- (a) creating and inserting a new call-back tag into a call-back routing table including a plurality of call-back tags;
(b) dividing all external lines connected to said PSTN into two sets, callback lines and non-callback lines; and
(c) searching said call-back table for said new inserted call-back tag, and directly connecting a corresponding PSTN called party number of said PSTN user to a corresponding PTN caller identifier of said PTN user via one of said external lines in a one-stage dialing scheme.
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Accused Products
Abstract
Disclosed is a method and apparatus applicable to an interface between PSTN and PTN for telephone routing. The interface includes a branch switch, a key system, a network branch switch, and media gateway, etc. The telephone routing method and apparatus of the present invention creates, maintains, and utilizes a call-back routing table to enable a specified PSTN user to call the callback external leased line to reach a specified PTN user in a one-stage dialing manner. The process of one-stage dialing includes PTN call origination to PSTN, PSTN call origination to PTN, and callback tag insertion in the call-back routing table. The call-back routing table consists of a plurality of call-back tags. Each call-back tag consists of at least a data triple, i.e. PTN user identifier, PSTN called party telephone number, and callback leased line identifier.
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Citations
20 Claims
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1. A method for telephone routing between a private telephone network (PTN) and a public switched telephone network (PSTN), said method is applicable to an interface apparatus between said PSTN and said PTN, said interface apparatus connects to a least one PSTN by using a plurality of external lines, and also connects to a plurality of telephony devices via an intranet, when a PTN user make a call to a PSTN user, said telephone routing method comprises the steps of:
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(a) creating and inserting a new call-back tag into a call-back routing table including a plurality of call-back tags; (b) dividing all external lines connected to said PSTN into two sets, callback lines and non-callback lines; and (c) searching said call-back table for said new inserted call-back tag, and directly connecting a corresponding PSTN called party number of said PSTN user to a corresponding PTN caller identifier of said PTN user via one of said external lines in a one-stage dialing scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for telephone routing between a public switched telephone network (PSTN) and a private telephone network (PTN), comprising:
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an interface unit that connects to at least one PSTN via a plurality of external lines, and connects to a plurality of internal telephony devices via an intranet, and provides the calling/receiving functions between an internal telephony device and a PSTN user; and a storage media that stores a callback table including a plurality of callback tags; wherein said telephone routing apparatus utilizes said callback tags to enable a PSTN user reaches its corresponding PTN user in a one-stage dialing scheme. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification