ADTRAN VVX 400 support was added in R10.6. You will need to upgrade your firmware to at least R10.6. You can download firmware here.
From R10.6 Release Notes:
.Added software configuration for a new line of ADTRAN/Polycom co-branded IP phones.
You can download the 4.1.4 VVX 400 phone firmware here.
Let me know if you have any other questions.
Well that makes perfect sense. I thought R10.3.2 started vvx phones. Thanks Mark!
Sent from my iPhone
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The VVX models came out at different times. When you get to a computer and if you don't mind, can you mark this as answered so others can benefit from this.
Thanks and have a great weekend!