Wrong mic selected on SGS2

I add more details in order to help to fix bugs related to "internet" (sip) calls :

- i use MIUI-2.1.20 on Samsung SGS2 (GT-I9100)
- integrated SIP client uses wrong (upper) microphone -> confirmed !
- if i edit an already created SIP account, server and protocol settings of that account are lost and i must insert them again.

Traditional (GSM) calls are working fine and correct microphone is selected.

Anyone else noticed this bug?
I've reported it to Xiaomi for some feedback.

Thanks for the report.