Hello & Welcome,
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) The FULL Model Number of the phone/answering system you are working with? If this is a cordless system, that model should be printed on a sticker on the bottom or back of the main base unit.
2) What phone service provider (phone company) you have for this phone line?
3) When/where are you hearing the "beep beep" you mentioned?
I just saw your call request, however I don't have a phone line available right now to be able to do a call. But another expert may respond to your request at any time.
If you can respond to my questions above, we can continue here in this Q & A format.