All the LAN ports are auto-sensing 10 or 100Mbps.
Like most LAN hub ports they are half-duplex. To the best of my guesswork that applies to the IP401, 403 and 406.
The Small Office Edition ports are switched and are full-duplex.
And the 412, despite being switched, strangely appear to be half-duplex.
I welcome being corrected as this appears to be a frequent question that isn't answered anywhere in the IP Office documents and brochures. Whilst with most equipment its safe enough to auto-negotiate some do like an exact setting.
Cheers and beers.