[Serusers] PSTN gateway failover

Hi all, Since SER does not provide DNS SRV failover capability, how do you perform failover for your PSTN gateways? I currently think about some sort of load balancing with exec_dset() which looks up a gateway in a mysql db and give it 10 tries to find a gateway (SER is running on my.domain:5060) route { if (!mf_process_maxfwd_header("10")) { sl_send_reply("483", "Too many hops"); break; } <snip> exec_dset("/my/sipgw-balancing-script"); # returns a random GW t_on_failure("1"); t_relay(); <snip> } failure_route[1] { if(t_check_status("503") { rewritehostport("my.domain:5060"); # peform loop append_branch(); t_relay(); } } Is this good practice? Any other ideas/optimizations? Cheers, Andy