Lync - SIP Location Service

Curently I have a deep look into the implentation of the SIP protocol in Lync.
There is one question I cannot answer by reading the official SIP RFC (http://tools.ietf.org/html/rfc3665).
I found a good article about address another SIP subscriber.
So far anything is clear for me:
UserA wants to communicate with UserB. He sends an INVITE to his related Proxy1 with the logical SIP address of UserB. The Proxy1 try to convert the logical into a physical address (IP address of User2) by using his location service.
He will get the physical location and redirect the INVITE to UserB.
UserA --> Proxy1 ---> UserB
|
Location Service
Location Server
"Each SIP domain has a location server. This server administers e.g. information on the bindings of logical and physical SIP addresses.
Location servers often operate on the same platform as the associated registrar server."
http://www-01.ibm.com/support/knowledgecenter/api/content/SSKTXQ_8.0.0/com.ibm.help.sametime.telephony.doc/03-Technologien9.html
So here are my questions related to Lync:
"Each SIP domain has a location server."
This isnt the case in Lync. Each registrar (Proxy) will store the location information of each homed user. If I have multible registrars, An INVITE from an User1 homed on Registrar1 will be redirected to the Registrar2 of the other User2. Registrar2
will look for the physical location of User2 by asking his location service. This means Registrar1 doesnt have the information about the physical location of User2, only the information about the related Registrar (Registrar2) of User2. Am I right?
Where is the physical address information stored on the registrar?
Thanks in advanced for your help,
Augustin

So here are my questions related to Lync:
"Each SIP domain has a location server." This isnt the case in Lync. Each registrar (Proxy) will
store the location information of each homed user. If I have multible registrars, An INVITE from an User1 homed on Registrar1 will be redirected to the Registrar2 of the other User2. Registrar2 will look for the physical location of User2 by asking his location
service. This means Registrar1 doesnt have the information about the physical location of User2, only the information about the related Registrar (Registrar2) of User2. Am I right?
In Lync or OCS we have the concept of pool say User 1 is enabled for Pool1 and User 2 is enabled for pool 2
When user1 tried to send a message to user2 it check if user 2 has supported sip domain if yes The it will check in AD where it has all Sip enabled user information for which pool User 2 is enabled ofr and then forward the request to that pool
Where is the physical address information stored on the registrar? In case of Lync it is the SQL database
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer" Regards Edwin Anthony Joseph

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