Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
What to do depends upon three factors I need to ask about:
1. what other phone and/or answering machine and/or fax -type devices are on the line with the phone in question?
2. what type of phone line service do you have? analong/POTS/landline, or digital/UVerse/MagicJack/etc. ?
3. and is there a DSL/ADSL modem on the line also?