As an alarm dealer/technician, I can tell you that using Xfinity phone lines for monitoring your alarm is like rolling dice, you may get lucky and have a signal go through, but more times then not the signal will not sent to your alarm company. This has been an ongoing problem that seemed to have gotten much worse when a certain company started offering not only TV, voice, and internet, but now home security as well. Do you self a favor and get whatever alarm company you use to hook up a GSM or LTE radio and ditch the phone line. With GSM/LTE, the signals go though 100% of the time as they should. Your basically hooking your alarm up to a cell phone to communicate; the radios offer faster signal speeds and troubleshooting for techs, and usually come with an app for your smart phone to manage your alarm while you are home or anywhere else in the world that has cell service. Also, before thinking about switching to Xfinity for security, you may want to Google their issues with RF encryption problems, and give the contract a good read... If you want a reliable alarm system that you can count on, go with a reputable alarm company in your area. I'm sure there are dozens with a better customer service track record within a stones throw from you. Just my 2 cents.
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