Network Communications External to the Cluster

The following details are all based on the default settings.  These can vary depending on the application setup and network design (such as NAT) of the solution, so may need adjustment accordingly.  Where a dependant is noted, this is fully dependant on the configuration with no default.

These communications are all related to communications with devices external to the cluster.

Outbound Communications to Devices from the Application/Unified nodes:

Communication	Protocol	Port
Cisco Unified Communications Manager (UCM)	HTTPS	TCP 8443
Cisco Unity Connection (CUXN)	HTTPS	TCP 443
Webex	HTTPS	TCP 443
LDAP directory	LDAP	TCP/UDP 389 and/or 636(TLS/SSL)
Cisco HCM-F	HTTPS	TCP 8443

Outbound to external systems from the proxy node:

Communication	Protocol	Network Protocol and Port
API Sync and Async responses	HTTPS	TCP 443
Northbound Notification messages	HTTPS	dependant

Outbound to external systems from all nodes:

Communication	Protocol	Port
SNMP	SNMP	TCP/UDP 162
SFTP as required for backup destinations	SFTP	TCP 22
NTP	NTP	UDP 123

Inbound communications from external systems to the proxy node:

Communication	Protocol	Port
Web Access	HTTPS	TCP 443
API Request	HTTPS	TCP 443

Inbound communications to all nodes:

Communication	Protocol	Port
SSH and SFTP for management and files transfers	SFTP/SSH	TCP/UDP 22