Comments
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Ok, I figured it out... I didn't remember but I added rules to the Asterisk's firewall to only allow certain providers' IP ranges... so I needed to update with Fizz's network. Sorry for the noise.
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And, yes, I'm using the modem shown above in the picture.
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I'm using my own Asterisk server. The SIP client is connecting using UDP on port 5060. That always worked everywhere until I hooked up to Fizz modem.
