Does one of the Lync SQL databases store the active directory username or SID of the person who made a call ?

Question

I am trying to write a report that uses data from Lync (2010), Active directory (AD) and other databases.
I need to match data from Lync with records in active directory.
When you make/recieve a call, the session details has a userid column - a foreign key to the users table, which has the UserURI - the users emails adddress or telephone number.
However, trying to mach the data, I have noticed that someones email address can change so that what is in active directory does not match that used as the SIPaddress in Lync.
I need a field that matches in Active directory and Lync to be able to link a users call records with their active directroy records.
I was wondering how Lync decides which Lync user you are when it auto logins you in.
Does it do it on the basis of your phone number, AD username or something else ?
If so , where in Lync does it store the mapping from whatever it uses to your Lync userid ?
Greg

Answer 1

The msrtcsip-primaryuseraddress attribute in AD is where the users SIP address is stored.
This can change still, but generally that should not be very often except maybe a name change or domain name change.
Almost everything in Lync is based on the SIP address. In CDR's case, it is just recording SIP messages as they pass through the front end; it has no visibility into the actual AD account that sent it.
If you will need to match user SIP addresses back to live AD accounts, even after a SIP address change, then I would recommend setting up a custom AD attribute to store their SIP account history and have a policy to update that attribute each time someone's
SIP address gets changed.