Convert two 3.5mm plugs to single 4P4C RJ headset plug Works great with most VOIP phones with a RJ9/Rj10/Rj22 headset jack Save money by buying PC headsets to use with your office phone's headset jack Does not work with RJ11 jack, which is wider...

Convert 3.5mm Smartphone plug to single 4P4C RJ9/RJ10 handset plug. Save money by buying a smartphone headset, or using your existing one with your Aastra phone's handset jack. Reduce clutter with single headset. Does not work with RJ11 jack, which...

Convert 2.5mm plug to single 4P4C RJ9/RJ10 headset plug for your VOIP phone Compatible with most IP phone headset jacks: Nortel, Avaya, Aastra, ESI, NEC, RCA, Mitel, Lucent, Shoretel, Siemens, and more... Save money by buying standard phone headsets...

Dual control with 2 mute buttons and dual volume controls Y shaped phone training splitter Listen-in only or train/take over call Works with wired or wireless headsets or a mix Use with Headset Buddy, Agent, Plantronics, Jabra, GN Netcom, and...

No more reaching under or to the back of your office phone to plug in a headset Great for hot desking where headsets are switched out often Works with all direct connect headset models including Plantronics & Jabra Works with all phone models...

Use your headset with almost any office phone - 8 settings cover most phone models Combines our PC35-RJ9A and PC35-RJ9Cisco adapters into one universal! Convert two 3.5mm plugs to single 4P4C RJ9/RJ10 headset plug. Works with mono and...

Use your 3.5mm headset with almost any office phone - 8 settings cover most phone models including Cisco Combines the PH35-RJ9A of the PH35-RJ9Cisco adapters! Works great with most VOIP phones with a RJ9/Rj10/Rj22 headset...

Use your headset with almost any office phone - 8 settings cover most phone models including Cisco Combines the PH25-RJ9A of the PH25-RJ9Cisco adapters! Converts 2.5mm plug to single 4P4C RJ9/RJ10 headset plug Works great with...

Convert 2.5mm headset plug to single 4P4C RJ9/RJ10 plug for your VOIP phone Compatible with most IP phone headset jacks: Nortel, Avaya, Aastra, ESI, NEC, RCA, Mitel, Lucent, Shoretel, Siemens, and more... Save money by buying standard phone...

Compatible with Apple EarPod and other Apple / CTIA based headphones or headsets.  Convert 3.5mm Smartphone plug to single 4P4C RJ9/RJ10 handset plug. Save money by buying a smartphone headset, or using your existing one with your Aastra,...