The Mitel MH88622 is a Dual Subscriber Interface Circuit which provides a complete interface between the telephone lines a dual codec, requiring a dual rail supply, battery and dc supply for ringing generation. The functions provided by the MH88622 includes 2-4 Wire conversion, constant current line feed, signalling and control. The SLIC manufactured using thick film hybrid technology which offers high voltage capability, reliability and high density resulting in a significant area saving on the printed circuit board. A complete C.O. type solution can be implemented with minimal external components. Different variants are provided to meet different country line impedance, they are: