It worked fine until the battery went dead. I purchased a replacement battery online and since then I do not have a dialtone when I turn the phone on. Also, when this phone is plugged up, my homeline rings busy. To make sure I could call out from others, I used a regular corded phone and it has a dialtone and rings in fine. can you help please? thank you!

Lands Phones - Plantronics - CT 12 Cordless Phone (CT12)