Call protect systems with handoff redundancy

US6590961B1 · kind B1 · utility

Assignee

• Nortel Networks Limited · CA

Inventors

• Roy A. Gulli · Mount Sinai, US
• Stephen M. Chiro · Oakdale, US
• Jacob Levine · Mountain View, US
• Govardhan Srikant · East Patchogue, US
• George M. Comstock · Stony Brook, US
• Robert F. Krolick · Islip, US

Key dates

• Filing date: Oct 12, 2000
• Grant date: Jul 8, 2003
• Expiry date: Apr 19, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q3/54558
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Call-protect systems are arranged, upon an operating failure, to handoff a call in progress and maintain processing of the call without disruption or need to reinitiate. Application processor (AP) nodes are configured to continuously run standby call processing (CP) facilities, in addition to running active call processing facilities engaged in current call processing. As a call is actively processed, call context information, such as caller and account identification and call status, is stored in memory within a call processing subsystem. Upon a failure affecting the AP node processing a call, call handoff is made to the standby CP facility of a different AP node. The capability of maintaining processing of the handoff call without disruption is enhanced by retrieval of the stored call context information for that call.