Hello All!

I came across a job where they want me to install a portable single line phone onto a Comdial Impact JO408 system. The problem is that there were no available ports. I need to expand the system. Do I use a GM408 for the expansion? Also, for the single line portable phone can I use an ATI-D, or is the JO408 system incapable of doing ATI? Please Help!!!

Thank You!