Has anyone tried to use the Aspire long range cordless phone on a DSX system. The DSX cordless lite works on both systems so I'm curious if the long range cordless may also works with both systems.

What do you mean by "long range cordless phone"? What phone are you referring to?

I am referring to the NEC 730088 cordless phone. The listed ranger is 350' as opposed to the DSX cordless lite at 150' range