Method and system to support internal calling upon loss of connection with IP Centrex server
First Claim
1. A method operable within a system of the type in which an enterprise network provides connectivity between a plurality of enterprise telephone stations, wherein a landline connection extends between the enterprise network and a packet-switched network, and wherein a call server sits on the packet-switched network and engages in packet-based signaling with the enterprise network to set up calls inside the enterprise network between the enterprise telephone stations, the method comprising:
- detecting failure of the landline connection; and
in response to detecting failure of the landline connection, (a) invoking a wireless wide area network (WWAN) connection between the enterprise network and the packet-switched network to allow continued passage of the packet-based signaling between the enterprise network and the call server to set up calls having bearer paths within the enterprise network between the enterprise telephone stations, and (b) at the call server, allowing setup of calls having bearer paths within the enterprise network between the enterprise telephone stations, while preventing setup of all but certain designated calls having bearer paths extending from the enterprise network and through the WWAN connection.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and system for facilitating calling within an enterprise network upon failure of a landline connection between the enterprise network and an outside call server such as an IP Centrex server. Upon failure of the landline connection, an enterprise router switches over to a backup wireless packet-data link, such as a 3G cellular link for instance. Thus, packet-based call signaling can continue to flow between the enterprise network and the call server so as to continue setting up inside calls between enterprise telephone stations. The backup wireless packet-data link can also be used to carry a limited extent of outside calls, such as emergency calls for instance.
69 Citations
18 Claims
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1. A method operable within a system of the type in which an enterprise network provides connectivity between a plurality of enterprise telephone stations, wherein a landline connection extends between the enterprise network and a packet-switched network, and wherein a call server sits on the packet-switched network and engages in packet-based signaling with the enterprise network to set up calls inside the enterprise network between the enterprise telephone stations, the method comprising:
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detecting failure of the landline connection; and in response to detecting failure of the landline connection, (a) invoking a wireless wide area network (WWAN) connection between the enterprise network and the packet-switched network to allow continued passage of the packet-based signaling between the enterprise network and the call server to set up calls having bearer paths within the enterprise network between the enterprise telephone stations, and (b) at the call server, allowing setup of calls having bearer paths within the enterprise network between the enterprise telephone stations, while preventing setup of all but certain designated calls having bearer paths extending from the enterprise network and through the WWAN connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An improvement to a system of the type comprising an enterprise network that provides connectivity between a plurality of enterprise telephone stations, wherein the enterprise network is coupled by a landline connection with a packet-switched network and a call server on the packet-switched network engages in packet-based signaling with the enterprise network to set up calls inside the enterprise network between the enterprise telephone stations, the improvement comprising:
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a wireless wide area network (WWAN) modem for providing a WWAN backup link between the enterprise network and the packet-switched network; routing logic, operable upon failure of the landline connection, to route the packet-based signaling via the WWAN backup link between the enterprise network and the packet-switched network, so as to allow continued setup of calls having bearer paths within the enterprise network between the enterprise telephone stations; and call-server-logic at the call server, operable upon failure of the landline connection, allowing setup of calls having bearer paths within the enterprise network between the enterprise telephone stations, while preventing setup of all but certain designated calls having bearer paths extending from the enterprise network and through the WWAN connection. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification