If a P710e produces no sound, verify the source device and the playback selection in both the operating system and calling application. Logitech recommends adjusting volume on the speakerphone and source, because either side can make an otherwise functioning connection seem silent.

For Bluetooth, disconnect a second paired source while testing and move the active device closer. For USB, attach the speakerphone directly to the computer and try another port. Restarting both devices provides another comparison after confirming that audio is actually being routed to the P710e.