we have two asterisk machines (hosted pbx service), one is primary and other is secondary. what making us confuse is that our client is registered via domain name to our primary server, so we planned if something happens to our primary server we will shift the DNS to our secondary server, but we don’t know how much time it gonna take to shift globally. So we planned to use secondary ip option on client’s ip phones, but it is also an issue, if some client would attempts incorrect login our primary server may block his IP and he will shift to secondary server. if he get registered to 2ndary server, he would not be able to communicate locally with other users who are on the primary server.
So what i am looking for is that what could be good solution to switch on 2ndary server on failover without letting the customer know that they has been shifted to any other server.
Any expert suggestion for my case.
Thanks in advance.