US 6,674,853 B1Granted

Integration of remote access and service

AssigneeAvaya Technology Corp.

InventorsJoel Ezell, John S. Helton, Norman W. Petty, Douglas A. Spencer, Wayne A. Zakowski

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Abstract

allowing a central business communication system to handle all aspects of call setup on a remote switch. Call control for a telecommunication call set up on a remote switch continues to be handled by the central business communication system; however, the switching of the bearer channels is performed automatically on the remote switch if the telecommunication call is between telecommunication terminals on the remote switch. In addition, if the telecommunication call is between two remote switches, the remote switches will automatically communicate the bearer channels through an interconnecting media without going through the central business communication system. In addition, when an Internet protocol (IP) such as IETF RFC 791 is utilized to communicate the bearer channels between the central business communication system and the remote switch, multi-frequency dialing tones received from analog telephones connected to the remote switching network are converted to digital information before transmission via the IP communication channels to the central business telecommunication system.

Claims12

Dependent claims

A method for redirecting telephone calls by a central switching system via a wide area network where the central switching system retains call control over the redirected telephone calls and the central switching system having a switching network and each of a plurality of remote switches having an individual switching network and each individual switching network having a plurality of connected telephone sets, comprising the steps of:

establishing by a first one of the plurality of remote switches one of a plurality of control channels for each of a first plurality of telephone sets connected to the first one of the plurality, of remote switches;
determining a call origination by the central switching system by a first one of the first plurality of telephone sets via a first one of the plurality of control channels for the establishment of a first one of the telephone calls to a second one of the first plurality of telephone sets;
establishing a first one of a plurality of bearer channels to the first one of the first plurality of telephone sets by the central switching system via the switching network of the central switching system and switching network of the first one of the plurality of remote switches;
transmitting an alert message to the second one of the first plurality of telephone sets by the central switching system via a second one of the plurality of control channels;
establishing a second one of plurality of bearer channels to the second one of the first plurality of telephone sets by the central switching system via the switching network of the central switching system and switching network of the first one of the plurality of remote switches;
communicating the first and second ones of the plurality of bearer channels by the switching network of the central switching system and the switching network of the first one of the plurality of remote switches;
transmitting a call answer message by the second one of the first plurality of telephone sets via the second one of the plurality of control channels to the central switching system;
determining by the central switching system in response to the call answer message that the first and second ones of the first plurality of telephone sets can directly communicate bearer information;
transmitting first and second path control messages to the first and second ones of the first plurality of telephone sets to directly communicate by the central switching system via the first and second ones of the plurality of control channels, respectively;
and
establishing a bearer connection between the first and second ones of the first plurality of telephone sets by the first one of the plurality of remote switches via the switching network of the first one of the plurality of remote switches in response to the first and second path control messages from the central switching system received via the first and second ones of the plurality of control channels.

8 more elements

An apparatus for redirecting telephone calls having a central switching system and a wide area network where the central switching system retains call control over the redirected telephone calls and the central switching system having a switching network and each of a plurality of remote switches having an individual switching network and each individual switching network having a plurality of connected telephone sets with each of the remote switches being interconnected with the central switching system via wide area network, comprising the steps of:

a first one of the plurality of remote switches establishing one of a plurality of control channels for each of a first plurality of telephone sets connected to the first one of the plurality of remote switches;
the central switching system determining a call origination by a first one of the first plurality of telephone sets via a first one of the plurality of control channels for the establishment of a first one of the telephone calls to a second one of the first plurality of telephone sets;
the central switching system further establishing a first one of a plurality of bearer channels to the first one of the first plurality of telephone sets via the switching network of the central switching system and switching network of the first one of the plurality of remote switches;
the central switching system further transmitting an alert message to the second one of the first plurality of telephone sets via a second one of the plurality of control channels;
the central switching system further establishing a second one of plurality of bearer channels to the second one of the first plurality of telephone sets via the switching network of the central switching system and switching network of the first one of the plurality of remote switches;
the switching network of the central switching system communicating the first and second ones of the plurality of bearer channels;
the second one of the first plurality of telephone sets transmitting a call answer message via the second one of the plurality of control channels to the central switching system;
the central switching system further determining in response to the call answer message that the first and second ones of the first plurality of telephone sets can directly communicate bearer information;
the central switching system further transmitting first and second path control messages to the first and second ones of the first plurality of telephone sets to directly communicate via the first and second ones of the plurality of control channels, respectively;
and
the first one of the plurality of remote switches further establishing a bearer connection between the first and second ones of the first plurality of telephone sets via the switching network of the first one of the plurality of remote switches in response to the first and second path control messages from the central switching system received via the first and second ones of the plurality of control channels.

8 more elements

Dependencies are inferred from the claim text.