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

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

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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

Overview

Specs

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MAIN OVERVIEW FEATURES:

Cable Type: Mini-phone/Sub-mini phone
Cable Length: 1.57"
Connector on First End: 1 x Mini-phone Female Audio
Connector on Second End: 1 x Sub-mini phone Male Audio
Device Supported: Audio Device, Headset
Color: Black
Compatibility:
Sennheiser Speakerphones:
- SP 20
- SP 20 ML
Limited Warranty: 2 Year

Model
Brand	Sennheiser
Model	506488
Type	Adapter

Details
Type	Stereo Cables
Color	Black
Length	4cm / 1.57"
Connector Number	2
Connector Detail	3.5mm (4-pole, female) to 2.5mm (3-pole male)
Terminal Gender	Female to Male

Features
Specifications	The 3.5mm to 2.5mm Adapter is ideal for all users of Sennheiser Speakerphone Series SP 20 and SP 20 ML, in combination with many wireless DECT handsets The adapter cable is used to connect DECT wireless handsets, equipped with a 2.5mm headset interface to the Sennheiser Speakerphone Series SP 20 and SP 20 ML. Please note that this adapter is not approved for use with wired desk phones due to potential grounding loops between the 3.5mm jack , the wired desk phone and the USB connector.
Features	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

Additional Information
First Listed on Newegg	July 27, 2017

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by Newegg.com's 30-Day Return Policy.
Read full return policy for details.

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

Learn more about the Sennheiser 506488

Customer Reviews of the Sennheiser 506488

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Manufacturer Contact Info

Item#: 22Z-004F-00001

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

Learn more about the Sennheiser 506488

Customer Reviews of the Sennheiser 506488

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Manufacturer Contact Info