Abstract: A telephone mouthpiece modular coupler for directly connecting a modular telephone line cord to a conventional non-modular telephone unit having electrical contacts and a telephone handset. A substantially cylindrical, flexible coupler cup containing center and annular electrical coupler contacts and a modular line jack is provided. The coupler cup is removably attachable to a mouthpiece portion of a telephone handset. When attached, the center and annular coupler contacts create electrical connections to electrical contacts of the telephone mouthpiece. The modular line cord can be connected at one end to the clip receptacle of a direct connect modem, and at an opposite end to the modular line jack of the modular coupler, directly connecting the modem to the telephone system without using a bulky and relatively inefficient acoustical coupler device.