The part number for the joystick listed on Cisco ordering configurator tool is "CIVS-JOY1-USB=" which is an OEM product from a company called CH Products.
The specifications can be found on: http://www.chproducts.com/oem/finger_desktop_hfx.html (model MJ4)
Regarding other compatible joysticks; any other USB joystick should work with the system.
PDI Help Desk Physec Team
ATP Partners (IPICS/Access Control/Video Surveillance) can open "P D I" cases online at: http://www.cisco.com/web/partners/tools/pdihd.html#~four
More information about PDI can be found at: www.cisco.com/pdihelpdesk
PDI help desk at a Glance: http://www.cisco.com/web/partners/downloads/765/tools/quickreference/PDIHelpDesk_AAG.pdf
Thanks Maher. I put one of these in 2 weeks ago and had fun figuring out what the buttons did. LOL