I'm having an issue where EC500 works fine to Cingular / AT&T cell phones but on Suncom and Alltell, the cell will ring then will drop the call as soon as the answer key is pressed.
What kind of Voice Mail Detection are you using in your configuration set? I had this same problem with Verizon and they did not accept message detection. I had to change it to timed. Here is a thread that might help
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