Method for resilient call setup through ATM networks for Softswitch applications
First Claim
1. A method for establishing resilient paths through an asynchronous transfer mode (ATM) network including at least an ingress media gateway, an egress media gateway, a first ATM switch, a second ATM switch, a link A connecting said egress media gateway to said first ATM switch, a link B connecting said first ATM switch to said ingress media gateway, a link C connecting said egress media gateway to said second ATM switch, a link D connecting said second ATM switch to said ingress media gateway, said method comprising:
- a. setting up a primary Switched Virtual Channel (SVC) connection from said egress media gateway to said ingress media gateway by using a specified ATM end system address (AESA) of a port on said ingress media gateway over said link A; and
,b. setting up a backup SVC connection using the specified AESA from said egress media gateway to said ingress media gateway over said link C,wherein at least one primary SVC connection and one backup SVC connection are established between said egress media gateway and said ingress media gateway over different routes for a same call between an egress end office and an ingress end office.
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Accused Products
Abstract
A method establishes two redundant Switched Virtual Channel (SVC) connections through ATM Networks using the same ATM End System Address (AESA) from a source ATM End Point to a destination ATM End Point. The method provides end-to-end path protection without relying on any underlying resiliency features of an ATM Network so that the set-up model is transparent to the underlying ATM Network.
76 Citations
20 Claims
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1. A method for establishing resilient paths through an asynchronous transfer mode (ATM) network including at least an ingress media gateway, an egress media gateway, a first ATM switch, a second ATM switch, a link A connecting said egress media gateway to said first ATM switch, a link B connecting said first ATM switch to said ingress media gateway, a link C connecting said egress media gateway to said second ATM switch, a link D connecting said second ATM switch to said ingress media gateway, said method comprising:
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a. setting up a primary Switched Virtual Channel (SVC) connection from said egress media gateway to said ingress media gateway by using a specified ATM end system address (AESA) of a port on said ingress media gateway over said link A; and
,b. setting up a backup SVC connection using the specified AESA from said egress media gateway to said ingress media gateway over said link C, wherein at least one primary SVC connection and one backup SVC connection are established between said egress media gateway and said ingress media gateway over different routes for a same call between an egress end office and an ingress end office. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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at a softswitch connected to an ingress end office, an ingress media gateway, an egress media gateway, and an egress end office; causing a primary SVC connection to use a specified ATM end system address (AESA) at a first port on said ingress media gateway over a first set of links, said primary SVC connection between said egress media gateway and said ingress media gateway; and causing a backup SVC connection to use said specified AESA at a second port on said ingress media gateway over a second set of links, said backup SVC connection between said egress media gateway and said ingress media gateway. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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at a softswitch connected to an ingress end office, an ingress media gateway, an egress media gateway, and an egress end office, said egress media gateway connected to said egress end office by two pairs of connections; causing a primary SVC connection to use a specified ATM end system address (AESA) at a first port on said ingress media gateway over a first set of links, said primary SVC connection between said egress media gateway and said ingress media gateway, said first set of links comprising two primary links between a first ATM switch and said egress media gateway; and causing a backup SVC connection to use said specified AESA at a second port on said ingress media gateway over a second set of links, said backup SVC connection between said egress media gateway and said ingress media gateway, said second set of links comprising two backup links between a second ATM switch and said egress media gateway.
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Specification