Gigaset CL660HX Duo - 2 Cordless DECT Telephones for Connection to Router, Anthracite Metallic & DECT Base Station GO Box 100 - Connection Analogue via TAE Connection or LAN Cable, in Black:
Gigaset E720 DECT cordless analog phones with Bluetooth 4.1 connectio
Gigaset CL660A TRIO Analogue Telephone Set Including 3 Handsets and Answering Machine: Amazon.de: Electronics & Photo
OBi312 - VoIP adapter that connects your analog phone to Telco and VoIP services | Poly, formerly Plantronics & Polycom
fieldphones.org - Episode 52 - Repeating coils from Germany, USA, Switzerland