[Serusers] PSTN gateway failover

[Jan Janak]

On 20-10 14:33, Andreas Granig wrote:
> 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?

  I would probably try to avoid mysql, because the scripts needs to
  connect to the mysql server and perform authentication/authorization
  each time -- that can be slow.

    Jan.