Question about 3Com NBX 2101 Business Phone (3c10248b-us)

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Line Noise I work for a school district, and we have dozzens of 3c10248 phones. I have two that have a really bad hum, but only when connected to the number dialed. The dialtone is nice and noise free. As soon as the party answers, you get a loud hum in the background. I have unplugged both phones and allowed them to update the new image. I have switched network cables. Any Ideas???? Thanks, Jason Feathers Fort Frye Local Schools Beverly, Oh 45715

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