Expressway Configuration Summary
Make sure that System host name and Domain name are specified for every Expressway and that each Expressway is synchronized to a reliable NTP service.The hostname can contain only letters, digits, hyphens, and underscores. The first character must be a letter, and the last character must be a letter or a digit.
Enable SIP on the Expressway-E and Expressway-C. (SIP is disabled by default on new installs.)
[Recommended] Disable automated intrusion protection on the Expressway-C and configure it on the Expressway-E. (From X8.9, this feature is enabled by default on new installations. See Expressway Automated Intrusion Protection)
Set Unified Communications mode to Mobile and Remote Access.
Configure the Unified CM, IM and Presence Service, and Cisco Unity Connection servers on the Expressway-C.
Configure the domains on the Expressway-C for which services are to be routed to Unified CM.
[Optional] Create additional deployments and associate domains, and UC services with them.
Install appropriate server certificates and trusted CA certificates.
Configure a Unified Communications traversal zone connection between Expressway-E and Expressway-C.
If required, configure the HTTP server allow list for any web services inside the enterprise that need to be accessed from remote Jabber clients.
[Optional] Configure SSO over collaboration edge, to allow for common identity between external Jabber clients and the users' Unified CM profiles.
Configuration changes on Expressway generally take immediate effect. A banner message or alarm will prompt you if a system restart or other action is required.