Does it change I.P. ‘s or get a reboot???
I have seen the A200 rebooting for no reason when you access some sites on the internet ,using is a NAT router. Nothing to do with VOIP, the router part just chock to death and the thing reboots in few seconds.
Try not to use the router, just use it as a voip handset.
I know, it sucks, the other option is the papaer weight .