Ge 26191 Duplex Wall Jack Adapter (White, 4-Conductor) Speaker Phone, Fax, Etc. Answering Machine Jack To Accept 2 Modular Easily Adds A Telephone At A Phones Or Phone & An Accessory Easily Adds A Telephone At A Jack To Accept 2 Modular Phones Or Phone & An Accessory (Answering Machine, Speaker Phone, Fax, Etc.)