[Freeswitch-users] Register Interval

What do most people use as a register interval for phones? On *, we always used 5 minutes and then had qualify setup, so we could keep track of the phones on a per minute basis as it "pinged" them every minute. FS doesn't do this to phones unless they are NAT'd, so if the reg is 5, we don't get any update for 5 minutes. I like the idea of checking my phones every minute so that I know if there is a problem right away when someone calls with an issue, rather than having to wait up to 5 minutes to see if it is still alive. Are most people using a small interval like 60 seconds? Or do they set it longer and just assume the phones are still alive in between registrations? Peder