asterisk users - Apr 2004 - Using externip in sip.conf with DNS name

Hello,
 
I tried to find out, when a domain name is checked when I use a domain name
instead of a IP Address for externip in the sip.conf but I did found
something on that. Does someone knows the behavior on that?
My problem is, that I have a dynamic IP address outside. This IP-address
will be changed at least after 24 hours. So I used a dynamic IP-address
service to get my external IP-Address. It is working fine, but I saw that
after I got a new IP-Address Asterisk was sending out still the old external
IP Address...
So, is this external IP address only checked during a startup of Asterisk or
is there function to force the check of the external IP on a regular base?
 
Hope, someone can help me...
 
Best regards,
Markus
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