WAN Bandwidth Requirement for Call Manager Database Sync

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May 18th, 2007


I have 2 different sites connected across WAN.Each site has a Call Manager Server.Imagine Site B CCM(Subscriber) database to get synchronised with Site A Publisher Database.What amount of Bandwidth is required if each site uses 1000 Phones..


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Chris Deren Fri, 05/18/2007 - 06:28

The requirement is ~900 kbps deidcated for the replication between CMs.


Chris Deren Sat, 05/19/2007 - 06:42

I state corrected the 900 kbps is only for Intra-Cluster Communication Signaling, you need additional 644 kbps for db replication. From CM SRND:


"The minimum recommended bandwidth between sites that are clustered over the WAN is 1.544 Mbps. This amount allows for the minimum of 900 kbps for ICCS and 644 kbps for database and other inter-server traffic."




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