4 call processing servers in cluster !

Hi all.
I have read that we can have atmost 4 CPEs in a cucm cluster, but then cucm can only convey primary secondary and ternary servers to phones. So in case i have 4 servers (that are call processing servers) how will the phones know about the 4th one ?

Here you go: http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmcfg/b02cmgrp.html
A Cisco Unified Communications Manager Group specifies a prioritized list of up to three Cisco Unified Communications Managers. The first Cisco Unified Communications Manager in the list serves as the primary Cisco Unified Communications Manager for that group, and the other members of the group serve as secondary and tertiary (backup) Cisco Unified Communications Managers.

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