Strange noise on my monitored fios phone line [telecom]

Subject: Strange noise on my monitored fios phone line

I recently switched to fios. Verizon turned on voice mail which I did not want and so they turned it off. No more stutter dialtone. But there is a sound that I hear on the monitored phone line, about once / hr. It sounds like what may turn on a MESSAGE WAITING lamp. Any idea what this is? Are they polling the lines? Here's the sound, and TIA.

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Michael Muderick snipped-for-privacy@muderick.com

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Michael Muderick
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