Hello all.

I have an IP Office 406 in my home. Currently I'm using one Definity 6416D+ and four 6408Ds. I have read that the 8400 series Definity phones (the ones that look like Partner MLS sets) are not compatible. Is that the case? If so, any idea why? I thought all the Definity phones were the same. I much prefer the 8400 series. Anyone have any input on this?

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