externhost is monitoring for ip changes with an interval of externrefresh, so far so good.

Wouldnt it be handy if asterisk would do an sip reregister if it detects an ip change?
My SIP provider has sometimes very high intervals of 1 hour and if ip changes, the registration doesnt work until it expires or asterisk is restarted or sip reload.

Or just everyone uses fixed ip addresses?

For now, seem to have to use a script with sip reload.