Is there more detail on best practices for setting up failover for the Sangoma Talk mobile app to a deployment with two physical PBXs with the Advanced Recovery module in place and dedicated external IPs with redundant ISP connections?
All I managed to find in the documentation on this wiki page: Confluence Mobile - Documentation is the following section with no details:
Sangoma Talk is provisioned to register only to a single FQDN (or IP) which can be set by the PBX administrator. Support for dual registration (i.e LAN/WAN or or auto failover) must be accomplished using DNS.
How is this accomplished in DNS? Are we supposed to set a low TTL on the A record and manually change IP address when we need to or is there a more automated way that the Talk app would handle the record look up with multiple different IP addresses listed?