Hello tone70, you should be able to find an MS Word document "Latest Communication Manager Software & Firmware Compatibility Matrix" on support.avaya.com. Download the latest version of that doc; it takes a bit of interpretation, but should list exactly what you're asking.
Page 43 of said doc says: "The G430 Media Gateway is not supported in configurations with primary Servers and LSPs running Communication Manager Releases earlier than 5.2"
So, there you go... CM 5.2 and later only, it looks like.
Also, for the main-board FW of the G430/G450, you should only use 30.x.x with CM5.2, and 31.x.x with CM6.x
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