This number appears in its entirety on Caller ID as 917961906200 with no hyphens, so I'm not sure whether it's area code 917 and the 00 at the end is extraneous, or it indicates an outside line (9) followed by 1 and the area code 796.  Also, 91 is India's country code.  Anyway, the people who call have heavy accents and want to send documents to employees who either work at other locations or don't exist.