www.eholovision.comNew website so i cant find a link to the crestron package. Its basically just a Crestron IIF attached to their standard entry cam/intercom.
This is not a plug n play System Builder piece. You will need a Crestron programmer to use it IMO. They have a tech there that can answer your questions better than i can.
We used TPS-6L's and assorted wired touchpanels for intercomming & camera viewing and it turned out really well.
Door chime can be heard over the DA speakers also.