RJ11 Male to BT(431A) Female Converter with Ring Capacitor

Commonly used in VoIP applications where the devices POTS (Plain Old Telephone System) ports are RJ11 standard. These ports are designed for plugging in any standard telephone-this converter allows a telephone with a BT plug to use those ports. This version has a ring capacitor built in-a version without the ring capacitor can be found HERE.