There are some special requirements you have to pass:
- The maximum round-trip time (RTT) between any two servers must not exceed 40 msec for Unified CM 6.0, or 80 msec for Unified CM 6.1 and later releases.
- The expected error rate should be zero. Any errors, dropped packets, or other impairments to the IP network can have an impact to the call processing performance of the cluster.
- Jitter is the varying delay that packets incur through the network due to processing, queue, buffer, congestion, or path variation delay. Jitter for the IP Precedence 3 ICCS traffic must be minimized using Quality of Service (QoS) features.
Note You can also combine the features of these two deployment models for disaster recovery purposes. For example, Unified CM groups permit configuring up to three servers (primary, secondary and tertiary). Therefore, you can configure the Unified CM groups to have primary and secondary servers that are located at the same site and the tertiary server at a remote site over the WAN.
Does it mean that I should use 1 Publisher and 1 Subscriber on side A and 1 Subscriber on side B?
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...