[N1/CM6] A caller told me that he experienced a strong echo. I was using the speakerphone and was totally oblivious to this -- at my end, the audio was 10/10. I presume that because of the voIP delay, my mic did pick up and resent the caller's voice, loud and clear. There is probably a way to handle this programmatically. In the meantime, it could be a good idea to display a warning on the handset whenever the speakerphone is activated, just to make us aware of this potential glitch.