We are planning to install Cisco Expressway-C and Expressway-E cluster across three separate data centers which are connected via WAN connection (No VPN). Please refer to the attached proposed network diagram for reference. Please let me know whether this design is supported and whether we will have control over inbound and outbound call routing thru a specific Expressway-E Expressway-C combination.
the official document for clustering Expressways version x12.5 is https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/Cisco-Expressway-Cluster-Creation-and-Maintenance-Deployment-Guide-X12-5.pdf
I think the first section to look at is
Clustering Prerequisites, Network conditions are met
About the control over inbound call/registration is mainly related to the DNS configuration, same document section Cluster Name and DNS SRV Records.
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