I'm not a phone expert, but if there is a phone jack near the location where you're moving the gateway to, just plug the gateway into that phone jack to "backfeed" all of the jacks in your house. Plug the phone in the "old" location into the jack located where you had the gateway.
Many people have cordless phones, so it's possible to simply plug the cordless base station into the Tel1 jack of the gateway. If you still have corded phones, then they should be able to be plugged into the home jacks that will be "backfed" from the Gateway.
I have a corded phone near my gateway, so I simply plugged a phone line splitter into the Tel1 port, so that one side of the splitter "backfeeds" all the jacks in my house and the other side of the splitter goes to my corded phone. This accomplishes the same thing as your "biscuit." I had to make no telephone line modifications.
It's only if you have an alarm system using the telephone lines that wiring can become a problem. If you just have phones, it's easy peasy.
Many people have cordless phones, so it's possible to simply plug the cordless base station into the Tel1 jack of the gateway. If you still have corded phones, then they should be able to be plugged into the home jacks that will be "backfed" from the Gateway.
I have a corded phone near my gateway, so I simply plugged a phone line splitter into the Tel1 port, so that one side of the splitter "backfeeds" all the jacks in my house and the other side of the splitter goes to my corded phone. This accomplishes the same thing as your "biscuit." I had to make no telephone line modifications.
It's only if you have an alarm system using the telephone lines that wiring can become a problem. If you just have phones, it's easy peasy.