European Patent Office Guidelines on Remote

Here is what is posted on their site:

Please DO NOT USE:
Microphones built into a PC, wireless headsets connected to the computer via Bluetooth, phone earbuds (even if wired) or standard VICO room equipment with array microphones. None of these perform adequately for remote interpreting. They do not cover the frequency range of 125 Hz to 15000 Hz that simultaneous interpreters need to listen and speak at the same time; see ISO/PAS standard 24019.