Nortel Norstar 2501-03308-001 is blinking green lights but will not dial out or get a dialo tone. Can someone please help.

Finally, I found it's because it needs to be connected on a digital line. Using a regular line will cause the unit to not detect any line since he's waiting for digital datas instead of an analog dial tone. I also found the user's guide here but it doesn't help. I just catched that it's part of a Norstar system.http://pdf.textfiles.com/manuals/TELECOM... ACU User Guide - Version 1.pdf Finally, I found it's because it needs to be connected on a digital line. Using a regular line will cause the unit to not detect any line since he's waiting for digital datas instead of an analog dial tone. I also found the user's guide here but it doesn't help. I just catched that it's part of a Norstar system. http://pdf.textfiles.com/manuals/TELECOM-F-R/Norstar ACU User Guide - Version 1.pdf