CAVA31 This Sennheiser CAVA31 headset cable is compatible for use with Avaya 1600 series phones only.This coiled cable can stretch to a number of feet to offer the user the flexibilty of moving away from their desk when required.The Sennheiser CAVA31 cable is fitted with an easy disconnect plug on end and a module plug on the other end for quick and easy connection into Avaya 1600 series phones and Sennheiser SH and CC corded headsets. Features: -Adapter. -Connector on first end: RJ-11 Male phone. -Connector on second end: Easy disconnect male audio. -Device supported: Audio device. -Device supported: Phone.