Cordless phones won't ring

I apologize if this issue has been covered, but I couldn't find anything in my searches even close to the problem I'm having. I'm running the latest Trixbox CE and I have a Linksys SPA2002 with one phone line and a cordless phone connected to it. I also have a fax machine connected to the same line with an RJ-11 splitter. When I receive an incoming call, the cordless handsets won't ring, however the fax machine does. It seems that if I plug in a corded phone, incoming calls will ring but for some reason the cordless phones won't. I've tried 2 different brands of cordless phone with the same result, as well as with and without the fax machine connected. Any ideas what the problem could be? The cordless phones light up when a call comes in, so they are registering the call but they won't audibly ring; and yes, I have checked that the ringers are turned on. I'm a little lost and don't know if the problem is with Asterisk/Trixbox, or the Linksys adapter?? It's weird that corded phones ring because it seems like it would be all or nothing.

I greatly appreciate any help from anyone.

Thank you,
Michael Segulja