Nortel Networks Corporation

Northern Telecom Limited

Joyce A Bradley

Weilin W Wang

Shing Yu Yeung

Thomas J Anger

Steven John Crossley

William C Leung

Roque M Ip

Syed Ayaz Ahmed

He Huang

A telephone network includes an Enhanced Call Routing (ECR) function that reroutes calls when the high usage route and fixed tandem routes are overloaded or otherwise unavailable. The ECR function tracks the operation of the telephone network on the basis of origination switches and destination switches and provides temporary network rerouting during outages and unusual loading situations. Further, the ECR function supports Local Number Portability (LNP) so that it may operate in those telephone networks that are designed and/or modified to support LNP. The ECR function resides on a signaling network element such as a Service Switching Point (SSP) and/or a Service Control Point (SCP). A call setup request is received by a Service Switching Point (SSP), an origination switch in the traffic network, and intended for a destination switch. Initial routing via a high usage route and fixed tandem route(s) are unsuccessful. The SSP sends a Network_Busy message to the STP/SCP supporting the ECR function. The ECR function then attempts to determine an alternate tandem route for the call. If successful, the ECR function directs the SSP to route the call along the alternate tandem route, the alternate tandem route either being via the telephone network or via an alternate telephone network coupled thereto. If not successful, the ECR directs the SSP to send the call to a resource for caller notification. In another operation, the ECR function monitors the number of Network_Busy messages received for each originating switch/destination switch pair in the telephone network.

Enhanced call routing in competitive local telephone networks

A method of accomplishing switchover from an inservice local to a remote NP (Network Processor) is described. The remote NP is periodically updated with configuration data obtained from the inservice local NP. Switchover from the local inservice NP to the remote NP is initiated. Communications between the remote NP and a plurality of NEs (Network Elements) is established nonsynchronously. The local NP is notified that the remote NP is established as an inservice NP.

Methods and systems for emergency routing restoration

Disclosed is an apparatus for quickly generating an error free MIB file of the type used by a SNMP manager to manage and display error and log trap messages received from agents reporting to said manager. This is accomplished by retrieving data from definition and template libraries to be used in conjunction with a network element database to correctly generate, element by element, a completed MIB file.

Methods and systems for generating an MIB file

Growing community of inventors

Rowlett, TX, United States of America

Joyce A Bradley