[Serusers] SER high availability setup

Hi, I am trying to deploy a solution as shown below: SER<------>Asterisk1 | --->Asterisk2 | --->Asterisk3 Calls come in to the SER machine. I want to distribute calls among the asterisk machines(all with the same specifications). I initially tried using DNS round robin. It works well but doesn not have builtin failover mechanisms. So if a machine goes down calls will not be rerouted and sent to other available machines. I then tried using DNS SRV but, it seems, unfortunately SER does not support failover support yet. Now I am not sure how to distribute load amongst these machines. Any ideas suggestions will greatly be appreciated. Regards, Danish