Hello & Welcome to Just Answer,
Sorry to hear of any issue you are having with your phones.
May I ask:1) The Model Number of the phone system you are working with? If it is a cordless system, please look for that model on the bottom of the MAIN BASE UNIT if the system.
2) What phone service provider (phone company) you have for this phone line?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
Without knowing the model number of your system or what service provider you have for this phone line, it is hard to give specific instructions. But I do have a link to a video that shows how to record a greeting on most Panasonic cordless systems. Please take a look.
I look forward to any further questions or results that you may have.
Thanks, ***** *****