What is the schematic? Which 4-pole 3.5 mm contacts correspond to the 3-pole 2.5 mm bands?

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Questions & Answers: Sennheiser 506488 3.5mm to 2.5mm Adapter for Sennheiser Speakerphone Series SP 20 and SP 20 ML, F/M

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3.5mm / 2.5mm Stereo Cables
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Sennheiser 506488 3.5mm to 2.5mm Adapter for Sennheiser Speakerphone Series SP 20 and SP 20 ML, F/M

Connect your DECT wireless handset to your Sennheiser Speakerphone Series SP 20 and SP 20 ML
Hands-free operation - The freedom to call and work
Easy, plug-and-play setup

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