How many phones are supported with a MCS 7835 cluster running cucm version 7.1 ? The documentation says 2500 per server however Cisco engineers are saying its 1000 if there's only one pub and one sub (the pub only able to handle 1000 phones) and then 2500 per server beyond that? That sounds wrong to me so I'm wondring if anyone heard something like that as well?
Thanks in advance!!!
The SRND recomendations are below. The 2-server MCS7835 Cluster is highlighted;
Unified CM Cluster Services
Within a Unified CM cluster, there are servers that provide unique services. Each of these services can coexist with others on the same physical server. For example, in a small system it is possible to have a single server be a database publisher, backup subscriber, music on hold (MoH) server, TFTP server, CTI Manager, and Conference Bridge. As the scale and performance requirements of the cluster increase, many of these services should be moved to a single, dedicated physical server.
With Cisco Unified CM 7.x, a cluster may contain as many as 20 servers, of which a maximum of eight may run the Cisco CallManager Service that provides call processing. The other servers may be configured as a dedicated database publisher, dedicated Trivial File Transfer Protocol (TFTP) server, or music on hold (MoH) servers. Media streaming applications (conference bridge or media termination point) may also be enabled on a separate server that registers with the cluster.
When deploying a cluster with Cisco MCS 7815 or equivalent servers, there is a maximum limit of two servers in a cluster: one as the publisher, TFTP server, and backup call processing server, and the other as the primary call processing server. A maximum of 500 phones is supported in this configuration with Cisco Unified CM 7.x on a Cisco MCS 7815 or equivalent server. When deploying a two-server cluster with higher-capacity servers, Cisco recommends that you do not exceed 1250 users in the cluster. Above 1250 users, a dedicated publisher and separate servers for primary and secondary call processing services is recommended, thus increasing the number of servers in a cluster.
It is also possible to deploy a single-server cluster with an MCS 7825 or greater servers. With an MCS 7825 or equivalent server, the limit is 500 users; with a higher-availability server, the single-server cluster should not exceed 1000 users. In a single-server configuration, there is no redundancy unless Survivable Remote Site Telephony (SRST) is also deployed to provide service during periods when the Unified CM is not available. Cisco does not recommend a single-server deployment for production environments. The load balancing option is not available when the publisher is a backup call processing subscriber.
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