I have a BellSouth GH5831 answering machine with a

I have a BellSouth GH5831 answering machine with a 5.8 GHz dual band cordless phone. I was going to move it to another room and when I did, I could not get a dial tone. Everything else worked fine. I moved it back to the original location and have he same problem. The answering machine works just fine and if I press the speaker button on the base set, I get a dial tone. I cannot get a dial tone on the hand set. The display on the handset works just fine, so it is not a battery problem. Thanks for your help.