Hey all, Within my sip_nat.conf I use the following: Code: nat=yes externip=xxx.xxx.xx.xx localnet=192.168.1.0/255.255.255.0 And it works fine however, my externip sometimes changes and I need to change the setting manually, so I decided to use my dyndns hostname instead with the following code: Code: nat=yes externhost=example.dyndns.org externrefresh=120 localnet=192.168.1.0/255.255.255.0 And do a "sip reload" on the command line and internally we can make outgoing calls and everything is fine. But for external extensions the phone rings and people are able to recieve and pickup calls but there is no audio! Once I change the setting back to externip the sound issue goes away. Any suggestions? I would really like to get externhost going so that I no longer have to worry about ip changes.