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) The Model Number of the phone system you are working with? That model should be printed on a sticker on the bottom or back of the main base unit and START with KX-TG.
2) Are you trying to record a NEW greeting, - OR - use one that is already on the system?
3) When you TRY to record, does the greeting play back to you - at the end of the recording process?
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?
I only ask because I did not see a response back, and without knowing the MODEL of your phone or your service provider, it is difficult to give you a proper answer.
BUT, I can give you a link to a video that shows how to record your own greeting - if this is a typical Panasonic cordless system. Please take a look and let me know if you CAN record your own greeting AND if it plays back to you - as shown in the video.
Click Here for Video --> https://www.youtube.com/watch?v=xqnQLiaGO7Q
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)