Most VoIP phone systems are compatible with the ModMic, however, many will require one or more adapters.
For VoIP Phones that use 3.5mm or USB Mic Input:
The ModMic Business is compatible right out of the box!
Other ModMics may require a USB adapter.
For older 2.5mm jacks:
You’ll need TWO adapters.
Simply plug the mic and headphone into the Y adapter and then attach the 3.5 to 2.5mm adapter and plug it into your phone.
For RJ9 and other RJ jacks:
You’ll need an 3.5mm to RJ9 converter like this one: