Cisco 7961G Stuck at Registering

I have FreePBX with commercial EPM. I am trying to connect a Cisco 7961G phone and it keeps getting stuck at “Registering”. The configuration picks up everything else, like date and time, extension and labels. Anyone know if there is a fix for this or some simple setting I need to change?

Quite outdated, consider upgrading.

What do you see is asterisk logs?

Some Cisco devices can’t handle long passwords, try shortening the password and let the phone grab the new config.

I got it to register by changing the PBX IP to an internal instead of a public. Our PBX is behind a firewall. NAT is set off in the config file, but I will try turning it on to use a public IP.

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