We increased the handset microphone gain of the IP111 by 6 dB to align it better with IP222 and IP232. If the handset was too quiet in a communication between two IP111, this update should help. Please remove the "hacks" if you try this firmware.

http://download.innovaphone.com/ice/download/p/published/Firmware%20Version%2011r2/IP111_IP112/113434/

Many thanks !