Thank you for posting this, this is the exact same issue I had with my 7960.
I wish voipo support told me about this forum a month ago when I called for additional config info. I was only told I had what I need and others have no issues with the Cisco 7960 phone.
I was using my Cisco 7960 with Broadvoice and Gizmo5 without issues with the Nat off. I'm now able to connect to all three with the Nat On, BV and G5 doesn't seem to matter if NAT is on or off.
Thanks again kiwijonnyboy
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