htc eris voice issue

[fhorta]

Hi all. My wifes droid eris is having an issue with voice sound. When calling or receiving a call she can hear person on other line fine but they cant hear her. I tried messing with it and made sure its not in mute and checked everything i could think of. If i speak into phone while on calling mode i can hear my own voice . I can hear music and everything coming from the phone. The problem is that voice sound does not travel out of the phone . Any help would be greatly appreciated. According to settings, the software installed on phone is 2.1 . We got this phone used and dont know if it was upgraded or if thats the factory software. Thanks forany ideas or suggestions.