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The handset is a four-wire device. One pair is for the microphone and the other for the earpiece. There isn't really a standard across manufacturers as to which pins of the jack connect to which, or for microphone type, impedance, etc.
It sounds like your recorder pickoff device's wiring is incompatible with the Polycom handset wiring and is connected only to the earpiece and not the microphone. Some devices have an option switch to change the connection, for example Plantronics headset adapters. This device on Amazon has good reviews with Polycom: http://www.amazon.com/TRX-20-Direct-Connect-Telephone-ADAPTER/dp/B000KL0XA6
However, the sweet setup is a Polycom VVX600 or similar with a USB stick. Very clear audio, in stereo! And it works with the speakerphone or headset as well as the handset. Saved as a .WAV file right on the memory stick. No extra wires or need for a recorder.
Thanks for your help
I'll check that
or may be go with a softphone that can record...
good day !