Some Blackberry Models Pin Out Collection

Some Blackberry Models Pin Out CollectionRing 1 has 1.4k ohm loading to ground. When talk play pause function button is pushed it applies a short across ring 1 and 4. With ring 1 disconnected the pearl plays via its internal speaker. How ever with 1 and 4 shorted it continues to play from its internal speaker.4 pin 3.5mm (2.5mm) plug connectorat the headset cableoriginal headset marked