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...

Adapts phones with a 3.5mm headset jack to either your corded headset amplifier jack, or to your wireless base station Easy to use and install Simple to use with most devices, amplifiers, and wireless base stations High-quality...

Dual control with 2 mute buttons Listen-in only or train/take over call Works with wired or wireless headsets or a mix Use with Headset Buddy, Plantronics, Jabra, GN Netcom and Sennheiser headsets Works with most makes of telephones with 2.5mm...

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...

Separate mic and audio channels so you can use an external microphone for quality audio recording Allows you to use high-quality gaming headsets with your smartphone Fits so you can keep your phone case on Compact and rugged design that goes where...

Share audio with a friend, or send audio from smartphone to speakers/stereo while keeping headset plugged in Fits so you can keep your phone case on Use with credit card readers (Square & PayPal) and pair of headphones simultaneously...

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,...