Unknown phone calls made on my landline #

[WirelessPup]

This is more of a technical inquiry from a review of the phone call breakout of my monthly bill.  There were twelve calls recorded from my billing number (fax # {edited for privacy}) to an unknown number ({edited for privacy}; Annapolis, MD).  All calls were approximately 1 minute in duration to the same number from period between 7/11/2013 - 8/9/2013.  My RJ11 telephone cable was not installed until 12 August.  The only time this line was ever in use was on 12 August during the printer/fax setup for testing dial tone for my new fax phone line.  There were not charges associated with these 1-minute phone calls.  My question to the general forum is this:  Are these calls merely automated test tones generated through the FiOS network for testing connectivity of the new phone line?  If this isn't the case, then I will need to contact the Fraud Department to initiate a fraudulent calls report.  Really looking for answers to this issue.    Please advise.  Thanx.  ........... hlfjr 🙂