Subject: [Sip] Session Initiation Protocol

From: "Hasnaa MOUSTAFA" <[email-masked]>
Date: Fri, 16 Nov 2001 13:50:35 +0100

Hello all,

Concerning the Session Initiation Protocol (SIP),
Its architecture is composed of a number of servers.
 
1- About the Location service or Database, is it seperate for each server or all 
    servers access the same location service to locate users.
2- I am a little bit mixed between the use of Redirect Server & Proxy Server
   ==> When exactly does the UAC contact a proxy server and when does it  
          contact the redirect server???
   ==> Is this is a mode chosen either to contact the redirect server or a proxy   
          server whenever the UAS address is not known?

Thank you for any reply

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