This is an AT&T adapter. the front has a huge Dual (1/4"?) phono jacks for the headset cord. The cord itself has a volume control, that then goes to a curly cord then to a Plantronics quick disconnecet. This is a Huge box that plugs into the Aux port on the phone. Just found the model number - 502C


[Linked Image from i26.servimg.com]
TouchPoint Networks.

Serving the Northwest Since 1991
NEC Shoretel Zultys T3 Tadiran