No you do not need to register a Gigaset Desk phone with a Gigaset Base Station as the Gigaset Desk phones plug directly into your router or PC. 

You can use a Desk phone in conjunction with a Gigaset Dect Phone and Base Station but you do not need to register your Desk phone as you did for your Dect phones previously as the Desk phones are set up differently.  

If we have supplied you with a pre-configured Desk Phone then you will be able to simply plug into your Desk phone to a PC LAN port or router Ethernet port and then use the phone.  Please click here for further information.