PSN100180 – Some IP phones are not automatically forced to unregister from the LSP/ESS and register back to their main server after an LSP/ESS server falls back to the main.

This problem occurs in Avaya Aura^® Communication Manager (CM) Release 6.3.

Some IP phones are not automatically forced to unregister from the LSP/ESS and register back to their main server after an LSP/ESS server falls back to the main. This can result in an invalid configuration when IP phones are forced off an LSP or ESS due to automatic fallback of survivable servers. Some IP phones will be registered with an inactive survivable server.

This occurs because there is a problem with the associated “disable nr-registration” System Access Terminal (SAT) command, which is used to move endpoints between main servers and survivable servers, depending on the situation. The problem happens when there are more than 10 IP phones in the network region. Only the first 10 phones in the network region will be forced to unregister instead of all of them. This can result in a configurations with IP phones remaining registered to undesirable servers that may not have VoIP resources to service them. The “disable nr-registration” SAT command is used for automatic fallback of survivable servers, the split registration feature, and can also be used manually by running the command on the SAT.

Also affected by this problem is the split registration feature which uses the “disable nr-registration” command to automatically disable network regions to force phones and H.248 Media Gateways off main servers to their associated survivable server. If split registration is in effect, only the first 10 IP phones will be forced off the main server.