william_chua Thu, 04/22/2010 - 02:07
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CUCM supports a maximum of 20 nodes in a cluster (1 Publisher and 19 Subscribers).

Madhusudhan Rao M Thu, 04/22/2010 - 02:14
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Is it same for both CallManager versions..since i heard that CCM 5 supports 1 Pub and 8 Sub..total of 9

Ayodeji Okanlawon Thu, 04/22/2010 - 02:35
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Regardless of the CCM version these are the facts

1. A total of 20 servers are supported in a cluster

2. Only 8 can be running CCM service at the same time

3. Only 1 can be a publisher


william_chua Thu, 04/22/2010 - 02:40
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Here's the exact statement from cisco documentation:

"A CUCM cluster can have up to 20 servers in it. Only one publisher server is allowed in the cluster. The publisher houses the read/write copy of the database. Up to eight subscriber servers can be in the cluster, with the restriction that only four of the subscriber servers can perform active call processing. If more than four subscriber servers are used in a cluster, the additional servers are dedicated standby servers in case the active subscriber server is not available. The other 11 servers in the cluster can be responsible for various services, including TFTP and media resources (conferencing, music on hold, transcoding)."


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