Configuring Thresholds and Incidents › What are Call Server and Call Server Group Thresholds? › Call Server Thresholds › What are Registration Failures?

What are Registration Failures?

Registration failures occur when a device fails to register with its call server. Excessive registration failures can indicate a configuration problem, a call server issue, or a network issue, such as a connectivity outage.

In some cases, excessive registration failures indicate a security problem that can impede server performance. When an endpoint An endpoint is any device where a media stream begins or ends, such as telephone, softphone, telepresence, voice gateway, media device, and video camera. attempts to register from an unauthorized address, the call server denies the registration request. The call server responds to every registration request. Therefore, excessive registrations use up bandwidth and occupy the call server as it resolves device addresses and processes requests.

For call server thresholds, you determine the number of registration failures that can occur before an incident is created to notify an administrator.

For a Registration Failures incident, review call setup performance statistics in the Performance Overview. Look for problems that are related to an overburdened call server. These problems can cause other issues. Then review the Phone Details report to see whether the registration requests come from an unauthorized IP address.