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This paper provides a list of the TCP and UDP ports that Cisco Unified CallManager 5.1 uses for intracluster connections and for communications with external applications or devices. It provides important information for the configuration of firewalls, Access Control Lists (ACLs), and quality of service (QoS) on a network when an IP Communications solution is implemented. While virtually all protocols are bidirectional, this paper gives directionality from the session originator perspective. In some cases, the administrator can manually change the default port numbers, though Cisco does not recommend this as a best practice. Be aware also that Cisco Unified CallManager opens several ports strictly for internal use. This paper does not include these ports.
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