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...

Convert 2.5mm plug to CISCO phone single 4P4C RJ9/RJ10 headset plug Save money by buying standard phone headsets to use with your Cisco phone headset jack Reduce clutter with single headset Does not work with RJ11 jack, which is wider than your...

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,...