Dundi - Which server do UA accounts reside on?

Hi,

I am trying to find out more about dundi. I understand that Dundi allows UA’s to login to any server on the farm and when call comes in to the farm, Dundi will dynamically locate which server the UA is registerd on.

Do I have to setup a SIP account for the UA on every server in the farm that the UA may be want to register on?

IT does not seem realistic that a 1000 user organisation would have to maintaint 20,000 accounts on a farm with 20 servers.

Any help would be greatly appretiated.

Thanks
Simon Carr