Questions on Reverse number Lookup from Outlook contacts

Hi Experts,

Please have a look at the below scenarios:

1. Users A and B or corporate users. User A’s mobile number is published in AD and included within lync contact card – hence available within lync address book of all other users. User A joins a meeting organised by User B from his mobile.
2. User C is an external PSTN user (not in corporate AD) and User B has added User A’s Name and phone number (in E.164) as an outlook contact. User A joins User B’s meeting from PSTN.

Questions:

1. Is the name resolution (Reverse number look up) will also depend on the outlook contacts?
2. If so, what logic it follows in the background?

Please advise. Many thanks.

Questions:

1. Is the name resolution (Reverse number look up) will also depend on the outlook contacts?
2. If so, what logic it follows in the background?