Poly 43038-01 is a cable for connecting a compatible professional headset to a phone with a 2.5 mm headset jack. It links a Quick Disconnect headset connection to a 2.5 mm three-pole plug and has a stated length of 0.45 m.
The listing identifies Panasonic KX-UT670N, KX-UT136N and KX-UT123N IP phones, as well as Polycom SoundPoint IP 321 and SoundPoint IP 331 phones, as compatible. It also lists Poly EncorePro 510, 510V, 520, 520V, 530, 540, 710 and 720 headsets. The same cable is listed under reference 85Q30AA.