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 (the KX-TGA numbers are for the HANDSETS of a Panasonic system).
2) How many TOTAL cordless handsets do you have with this system?
3) What is the AGE of this system, and WHEN the batteries were replaced the last time?
4) Is that "second phone in another room" PART of the Panasonic system, or a different manufacturer (brand)?
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 look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)