In addition to the bandwidth required for Intra-Cluster Communication Signaling (ICCS) traffic, a minimum of 1.544 Mbps (T1) bandwidth is required for database and other inter-server traffic for every subscriber server remote to the publisher.
I think that you will need a WAN upgrade, particularly if the FR link supports voice traffic plus other data.
A minimum of 1.544 Mbps
(T1) bandwidth is required for Intra-Cluster Communication Signaling
(ICCS) for 10,000 busy hour call attempts (BHCA) between sites that are
clustered over the WAN. This is a minimum bandwidth requirement for call
control traffic, and it applies to deployments where directory numbers
are not shared between sites that are clustered over the WAN. The
following equation may be used as a guideline to calculate the bandwidth
for more than 10,000 BHCA between non-shared directory numbers at a
Total Bandwidth (Mbps) = (Total BHCA/10,000) * (1
+ 0.006 * Delay), where
Delay = RTT delay in msec
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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[toc:faq]CUCM Database Replication is an area in which Cisco customers
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