When trying to connect an external sip client to my home Asterisk (Trixbox) after setting up the extension with nat=yes and qualify=yes I could connect and register to the machine, you can check this by using ‘sip show peers‘ from the asterisk CLI
To resolve this issue, I manually edited the sip_nat.conf file, below is my configuration.
nat=yes
externhost=XXXXXXX.dyndns.org
localnet=192.168.1.0/255.255.255.0
externrefresh=120
If you have a static ip, you can use externip=xxx.xxx.x.xx instead of externhost
Also, in my sip.conf file I have the following.
bindport=5060 ; UDP Port to bind to
bindaddr=0.0.0.0 ; (0.0.0.0 binds to all)
rtpstart=10000
rtpend=20000
You can edit these files via the config editor built into trixbox, or from an SSH terminal using Putty with the easy to use nano text editor
You may also need to point the following ports to your asterisk / trixbox from your router
SIP port: 5060
RTP Ports: 10000 – 20000
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Tags: asterisk, audio, sip, trixbox
Hopefully everything will register for you with those settings, you will need to have the appropriate ports in your router and your sip_nat.conf and sip.conf configuration corrected as outlined in the bottom of my previous post