Plantronics® / Avaya 61804-03
HIP Adapter Cable

For Definity 4610SW and Definity 4620SW IP Telephones
$33.00 from an Authorized Plantronics Distributor
 

For 4610SW IP Telephone (700274673), the HIC cord (408122950) is recommended.                                          
For 4620SW IP Telephones manufactured prior to November 2004, the HIP cord (700212442) is recommended.
For 4620SW IP Telephones manufactured from November 2004 to present, the HIC cord is recommended.