There is an issue with CMS 1.2.18314.4 on my motorola defy+ (android 2.3.6 (4.5.1-134_DFP-231))
It took time and even wipe to find out that the reason is CMS =)
this issue appears even on clean system (after wipe) after installing CMS (from market) and dissapears after deinstalling
When i have incoming call - voice volume level becomes equal to ringer volume level, so i have very low initial voice level in silent mode (0) and loud initial voice level in normal mode (15). If i set ringer level to any position - i have this level with next incoming voice call, i can change it during call with volume buttons, but i don't want to do it every time and it will be reset with next incoming call anyway.
don't judge me for my English, cause i'm Russian =)