dyndns and sip_nat.conf

Handy, but it will only be picked up on a reload.

externhost instead of externip takes care of this for you.

I saw the reload, not sure I would want a script running a reload every 30 minutes. I should have chosen my words my carefully.

How difficult would it be to store the IP and only reload if the IP updates?

IAX2 does not refresh the host so triggering s script to restart IAX also on IP change would be very handy.

Thanks again....

iCyberNet: There is no mismatch, it just doesn't allow the sip audio pass. externip works perfectly.

Scott: I'd actually removed the logic to do the comparison since the script is launched by cron and runs anyway regardless and all it does is rewrite that one file. However, should you want the file not to be overwritten if the ip hasn't changed, I've put the script below with that logic back in.
I'm not sure what you mean by restart IAX, but the script does complete reload of all config files.

#!/bin/sh

# HOSTNAME is your DynDNS hostname
HOSTNAME=your_hostname.dyndns.org

# NSLOOKUP is the current DNS entry for your DynDNS hostname
NSLOOKUP=`/usr/bin/nslookup -sil $HOSTNAME | tail -2 | head -1 | cut -d" " -f2`

# get current ip of the router
CURRENT_IP=`/usr/bin/lynx -dump <a href="http://www.netins.net/dialup/tools/my_ip.shtml" title="http://www.netins.net/dialup/tools/my_ip.shtml">http://www.netins.net/dialup/tools/my_ip.shtml</a> | grep -A2 "Your current IP Address is:" | tail -n1 | tr -d ' '`

# update the sip_nat.conf and re-read configs
if [ "$NSLOOKUP" != "$CURRENT_IP" ] ; then
echo "externip=$CURRENT_IP
localnet=xxx.xxx.xxx.xxx/255.255.255.0" > /etc/asterisk/sip_nat.conf
chown asterisk.asterisk /etc/asterisk/sip_nat.conf
asterisk -rx reload
fi

Scott,

Would be interested to see what you come up with. The one thing that bugs me (and I'm not sure I read you right) is the asterisk reload. I assume you mean something like "amportal restart" and that be problematic as you would have no control over when that would happen and could potentially cut off ongoing calls.