How can I get the external caller id to show on the polycom 501 phones. Currently, when someone calls our office, we only see the word "asterisk" in the caller id.<br> <br> This is our set up:<br> <br> VOIP(polycom)<--------------->Asterisk 1.2.4<--------------->PSTN<br> <br> Thanks<br> <br> <p> 
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