Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) Can you CONFIRM that this is a Vtech ia5874 system?
2) If so, can you still make and receive CALLS - if you answer them BEFORE the Answer system picks?
3) What phone service provider (phone company) you have for this phone line?
4) Do you have a different phone - such as a cell phone or neighbor's phone - that can be used to place a TEST CALL to this phone system?
NOTE: If you see ANY requests for "additional services" - such as a phone call - please understand that these are sent BY THE SITE (and not me).
Feel free to DECLINE any such offers, and continue in this text/chat form.