We currently use a self-hosted [in-house] Microsoft Lync solution for VOIP with 4 Microsoft servers. Meaning, we have this in-house on our KVM cluster.
External dns records are at our registrar, and resolve to wan rout able external ip addreses of which are further NAT's to the internal addresses via our Sonicwall using Comcast.
We are getting another ATT line, with 5 more rout-able IP addresses, and want to set up DNS fail over for INBOUND connections to the servers above, should one internet line go down. I know outbound is possible, we use it now, I'm talking about Inbound only.
My question is, does Amazon Route 53 support DNS failover, for a self-hosted connection, and not just for whats in the VPC.
My alternative is to implement one of several hardware solutions which addres this issue.