Hello & Welcome to Just Answer,
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) How many TOTAL cordless handsets do you have with this system?
2) What phone service provider (phone company) you have for this phone line?
3) If you have ANY other devices (phones, fax, alarm system, etc.) attached to this same phone line (not part of the MAIN system), and if so, are they working properly?
4) If you have access to another phone line (such as a cell phone or neighbor's phone) - so YOU can call your own phone number and hear the announcement? If so, please make that TEST CALL and let me know EXACTLY what announcement you hear.