We have been having this problem since we were switched to Uverse pro internet. When we make a call, or recieve a call, the modem disconnects ( internet light turns red ). It comes back on in about a minute. We have a Motorola modem 2210-02-1 style MIPDSLA. I have a filter on the phone line. I have tried both the split filter and no filter on the modem line, the same issue occurs. We have switched filters and phone jacks - same issue. I have read somewhere that it may be that we have an MTU on our line and that ATT can check for that. How do we arrange that?
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