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Third party alarm not working since install

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Third party alarm not working since install

Alarm system not working. Xfinity tech just left after installing a second modem connected to alarm system.  When testing alarm lost both landline and no signal to alarm system. Tech felt it was an alarm company problem.  Worked under verizon but doesn't work with xfinity.  Anybody experiencing a similar problem.  The alarm company will charge a $75 fee to come out and inspect.