Parents on iMac using FaceTime - can't hear them with my iPhone 4

Question

First support post. This one's really stumping me. Haven't called Apple Support for an answer yet. I hope someone here can help.
So, here's the situation.
I use my iPhone 4 (latest software updates, not jailbroken, etc.) to FaceTime with my parents who are at home on their 21" iMac (the latest generation before the new new ones that just came out). It's running 10.6.7. It has the latest version of FaceTime (the one that costs 99 cents). When I call, we connect and I can see my parents just fine. They can hear me perfectly whether I'm using earbuds or not. But I can't hear them. When I use iChat to video chat, it's perfectly fine. Everything works. It doesn't matter if I send them the FaceTime call or they send it to me. I can't hear them.
I  tested the problem on my wife's Mac Mini. When I FaceTime with her, she can hear/see me, I can hear/see her. I tested it with my buddy on his Mac Pro. He can hear/see me, I can hear/see him.
I've run software update on my parent's iMac (using screen sharing). I've checked the sound settings in system preferences. I've scoured forums for this exact problem and I've had no luck.
Anybody have any ideas why I can't hear them on my iPhone 4 using FaceTime ... but I can hear everybody else I FaceTime with?
Any help would be greatly appreciated.
Message was edited by: matthew o-b

Answer 1

No solution, just posting that I have the same issue.
Sisters iMac in Wisconsin, my iPhone4 in Los Angeles..
Whats strange about it is, when she calls from her iMac, I get her sound for about a minute, and then it goes dead (though she can always hear me.) If she calls back, still no sound. It resolves itself a day later, but then again sound will cut out after about a minute.
However, if she facetimes me from her iPod touch, it works fine. Sound has never cut out when she uses that.
Like I said, no ideas, just sharing my situation. Hopefully Apple has noticed this bug and is working to fix it.