Analog Telephone Adapter usage

[Thufir]

I'm looking at the http://www.grandstream.com/y-286.htm, which is an
Analog Telephone Adapter for VOIP.

The ATA will initially configure its own IP address with DHCP?

'IP Address:
dynamically assigned via DHCP (default) or PPPoE (will attempt PPPoE if
DHCP fails and following is non-blank)'
http://www.grandstream.com/user_manuals/HandyTone.pdf

Sounds like a piece of cake.  Once it's configured, how is the ATA made to
work with http://www.gizmoproject.com/?  I would just pick up the phone
and dial?  There must be some configuration beyond that.

-Thufir