[Asterisk-Users] Asterisk on dynamic extrenal IP behind a nat router.

[Wilson Pickett]

> Is there no way to have asterisk determine its IP either via upnp or else
> resolve a dyndns hostname rather then having an entry in the config file?

For SIP you need to change the externip= variable and then "sip
reload". If you detect the ip change using a cron script (dyndns.org
has info on this), you can easily do this, I did it for months until I
finally got a fixed ip.