Have you tried to dial *#*#4636#*#* ?
This worked for me,I have E120S and I set the network type to "WCDMA preffered" and fixex the issue of missing sound in calls.
However there are few more issues which I'd really like to have fixed
1) Microphone - I receive lot of complaints that it's difficult to hear me, like cutting the sound in the middle of words.
2) Speaker - When I answer it's really loud no matter how it's set up, then after I change the volume up or down, it stabilizes.
3) Screen flicker - The screen makes weird quick flickers from time to time.
4) Screen orientation - It doesn't work properly as mentioned before, it's inverted - landscape is portrait.
5) WiFi reception - it's lower than usual.
Thanks for the ROM, I really appreciate it and keep up the good job.