soltangris, you'd said in some cases the root cause may be either a faulty 325A audio switch IC chip, or bad solder points.
Would this affect only voice calls? I am also having a problem with no audio during voice calls, and I heard a crackle when it went out, so I thought it was hardware for sure, but I can hear data calls (skype) through the handset speaker fine. Don't want to risk a resolder if that doesn't add up. Thanks.