I'm a tech for a low volt company. This has been a standing issue for sometime. It became a big issue when Xfinity rolled out their X-Fi modems. Typically replacing that modem with their XB3 modem has resolved the issues. But occasionally it still persists. And Xfinity swears that they have no part in the problem. I have over time found a few techs (when I was able to reach an actual tech) with comcast tech support that have made some sort of revisions to the way the modem is partitioned for phones. If they are infact making changes as to attempt to pull customers away from local companies, they have been successful. This situation always turns into the alarm companies pointing fingers at Xfinity and them pointing it back. So to any customers reading this, consider that prior to your switch to Voip with xfinity there were no problems. And as suggested above, it is definately a good idea to switch to GSM or LTE on your alarm. Problem is there is a cost involved on the alarm companies behalf to resolve an issue they didnt create.
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