Since yesterday, my phone has no sound, when making phone calls. The connection is made, the other party can hear my voice but I can not hear theirs. This has never happened before and as I did not install anything else recently, I figured it might have something to do with the cssu. I looked through the bug list but could not find anything associated, hence the posting here. Anyone else experiencing sound trouble with calls?

Edit: My calls are made with a SIP account.