If you use Plantronics Headsets there is a "Y" cord made specifically for this purpose.
"Y" Training Adapter
The Y training cable allows you to connect two headsets with QD (Quick Disconnect) connections to one phone. It also includes a mute switch which allows you to mute either headset.
This adapter is compatible with the following products:
QD amplifiers, such as the M12, M10, M22, MX10, M12 LUCM, A20, and S20
DA series adapters (for USB ports)
Avaya/Lucent HIC and HIP cables
It is not compatible with the S12 or any cordless/wireless products. (A CA10 with a 2.5mm to QD adapter cable is the only exception.)
The part number for the Y training adapter is 27019-03.
There are 2 versions of the Y training adapter. The difference is the version of the QD locks in the package.
27019-03 has 62976-01 - Latest version of the Quick Disconnect (QD) lock
27019-01 had 29733-01 - Older version of QD lock
If you have an older style of QD connection (which has a flat edge rather than a semi-circle at the end), the Y cord for those versions of QD has been obsolete and is no longer available. They were part number 21847-01 (for SSI) and 21847-02 (Supra) and they also did not have a mute switch.
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