This is a support response from Earthlink
Unplug all of your existing phones, caller ID boxes, fax machines, etc. that are on the same physical line, then have a buddy call. If the connection does not drop then keep swapping phones and filters until you isolate what the problem device is.
If your connection does drop, then replace the phone and the filter with another phone and filter and have your buddy call again. If the connection drops again then it's most likely not an issue with a phone or filter, but a problem with the software or wiring.
Please respond to this post to let us know if your issue is resolved. If you have any further problems, questions or concerns please feel free to contact us via the live chat link below.
Robert O.
Electronic Support
Earthlink Incorporated
For live online support please click on the following link.
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support.earthlink.net/mu ··· ort.html