This is a VXi EHS adapter #203414 for Cisco IP phones.  Use this EHS adapter with VXi V200 Cordless headsets.    

VEHS-C1 Technical Notes:

Phone Requirements:

For Cisco IP Phones: 7821, 7841, 7861, 7942g, 7945g, 7962g, 7965g, 7975g, 8811, 8841, 8851, 8861, 8865

Cisco Communication Manager 4.1 (3) or higher and IP Phone firmware 8.3 (3) or higher (SIP or SCCP) 

(To check firmware version, press the Settings button on the phone (Checkbox icon). Select “Model Information”. Firmware revision is listed under “Load File.”) 

Cisco Phone Setup 

• Press the Settings button on the phone (Checkbox icon). Select “Device Configuration”, then “Media Configuration”.
• If “Wireless Headset Hookswitch Control” shows “Disabled”, contact your telephone administrator as this may require configuration through a TFTP server or via the Cisco Unified Communications Manager Administration application.

VEHS-C1/V200 Setup on Cisco phones

1. Attach the VEHS-C1 to the V200.
2. Remove the panel from the bottom of the base station (refer to the V200 User Guide for additional information).
3. Attach the VEHS-C1 to the bottom of the V200 by carefully inserting the plastic guide pin into the screw-hole socket on the base of the V200, then press together the rear of the V200 base and VEHS-C1 until it snaps into place.
4. Insert the color-coded cables from the VEHS-C1 into the corresponding color-coded jacks of the V200 base station; the connectors should ‘snap’ in place when fully inserted.
5. Connect the longer VEHS-C1 cable into the AUX port of the phone (generally located on the bottom of the phone).
6. Connect the Base Jack cord into the V200 base jack port (orange dot on base) and the other end into the Headset port of the phone.
7. Set the V200 to work with your phone:
   • Mode 2
   • Compatibility Switch is set in position “A”
8. Set the best audio levels in the V200 by doing the following:
   1. On the phone, adjust the volume levels until they are just below half-way.
   2. Increase the V200headset volume levels all the way up, until three quick tones are heard in the earpiece.
   3. On the V200 base station, decrease the microphone volume levels all the way down, until three quick tones are heard in the earpiece.
   4. Place a test call. While on the call, decrease the V200 headset volume until at a comfortable level and increase the microphone level so that the person on the other end of the line can hear you well. If you hear your voice echoing in the earpiece, decrease the microphone levels slightly to reduce the side-tone feedback.