To Connect the Handset:

Connect the short straight end of the phone cord to the handset and the corresponding longer straight end of the cord to the handset jack on the back of the phone.

Polycom SoundPoint 335 - Connect Handset and Headset 1

To Connect the Headset:

Connect the headset (optional) to the headset jack on the back of the phone.

Polycom SoundPoint 335 - Connect Handset and Headset 2