I am reviewing options for failover and looking to simplify our client setups.
Regarding the following:
www.pbxforums.com
We use a similar setup of a CNAME for each client pointing to our primary URL however is there a reason why all clients cannot simply use the primary URL for provisioning?
Regarding the following:
DNS failover primary/secondar
Are there any gotcha's setting up a primary/secondary FusionPBX pair of servers? They will be in different data centers on different public IP addresses. They will be used for failover only, not for load balancing. FusionPBX default account will use DNS in addition to subaccounts. For syncing...

We use a similar setup of a CNAME for each client pointing to our primary URL however is there a reason why all clients cannot simply use the primary URL for provisioning?