Can anyone tell me whether the Draytek AP-900 wireless access point will support roaming VoIP calls?

I have an office which requires 3 AP stations and users who want to wonder around using VoIP. Current AP-800 devices won't allow my users to roam away from the AP-800 signal which initiated the call - very frustrating.

Same applies for Skype.

If you're using 802.1x then it will support fast-reconnect, but there will always still
be momentary break as the client device still has to decide and switch.

Thanks - would you expect most clients, say Samsung Galaxy S3 phones to be able to handle this disconnect/reconnect without dropping a VoIP call?