Plantronics Cisco WS-2620 Push To Talk Handset Cisco Ip Phones Plantronics Cisco IP Phone Push-To-Talk Handset. Manufacturer Plantronics, Inc. Compatible Devices: Cisco IP Phone - 7910, 7910+SW, 7940, 7960, Selsius, 12SP and VIP30. It addresses the need for security in environments. It is also recommended for environments with loud intermittent background noise.