How about the Plantronics S12 or Plantronics S10 complete corded headset system?
The S12 and S10 complete corded headset system are systems that connect to your telephone in the same was as explained above and are compatible with the sizable majority of single- or multi-line telephone sets. The S10 was discontinued and replaced by the newer model S12. Please understand that neither of these has the QuickDisconnect feature. The headset packaged with these systems plugs into the base unit using a typical modular phone plug. The S10 and S12 both have an AC power adapter included.
To check out our Plantronics we have available, please visit: www.useddialers.com/plantronics.htm