Telecom Interface and Voice Decoder

XD567DIP-8 Tone decoder 4.75-9V Datasheet
XL33290SOP-8 ISO K Line Serial Link Interface 8-18V Datasheet
XL9170SOP18 Dual Tone Multi Frequency(DTMF) receivers 2.5-5.5V Datasheet
XD9170DIP-18 Dual Tone Multi Frequency(DTMF) receivers 2.5-5.5V Datasheet