Author: Admin

Unified CM High Availability Because of the underlying Unified CM clustering mechanism, a Unified Communications System has additional high availability considerations above and beyond hardware platform disk and power component redundancy, physical network location, and connectivity redundancy. This section examines call processing subscriber redundancy considerations, call processing load balancing, and redundancy of additional cluster services. Call Processing Redundancy Unified CM provides the following call processing redundancy configuration options or schemes: Two to one (2:1) — For every two…

DRS backup never releases lock – stops performing backups CSCsr87199 Description Symptom:– DRS Backups stop executing automatically. – When you attempt a manual backup, you get an error saying: “Backup operation currently in progress…. please wait and try after sometime” – When trying to install a new version or a COP file, you get the following error: “The system is currently locked by another process. Please try again later” Conditions: Occurs if DRF is scheduled…

  CUCM Database Replication is an area in which Cisco customers and partners have asked for more in-depth training in being able to properly assess a replication problem and potentially resolve an issue without involving TAC.  This document discusses the basics needed to effectively troubleshoot and resolve replication issues. Replication Architecture CUCM 5.x Replication Architecture Communications Manager 5.x has a similar replication topology to Callmanager 4.X. They both follow a hub and spoke topology. The…

Hi Guys, While working with CUCM 9.1.XXX i faced some rare issues when performing normal tasks , we start getting below errors  and while working with Cisco TAC  they informed it a BUG and they provided a customized image UCSInstall_UCOS_9.1.2.13055-1.sgn.iso  to fix it permanently:   Symptom: -Slow web access and dbreplcation issues -Database Communications Errors -Unmapped Exception java.sql Exception : Memory Allocation failed during query processing -Unmapped exception java.sqlException: Cannot initiate sort -Error occured while retriveing…