bandwidth needed for call manager DB in a distributed design

[tphenry8428]

I am designing a distributed design and I need a budget for bandwidth needed between subscribers?

thanks

[gogasca]

From 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.

A maximum round-trip time (RTT) of 40 ms is allowed between any two servers in the Cisco Unified CallManager cluster. This time equates to a 20 ms maximum one-way delay, or a transmission distance of approximately 1860 miles (3000 km) under ideal conditions.

[goranvelickovski]

I'm looking at the same issue. We are adding another subscriber to an existing cluester and the WAN link is 3Mbps. According to your answer, this will be enough bandwidth. Please send me any links that support this.

thank you

[gogasca]

Sure:

Here you are:

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guide_chapter09186a00806e8c27.html#wp1045871

HTH