---

---

The above answer is right follow.

---

Posted by HamidAliKhan

The Location Server does not know where the User is so the Redirect Server returns a number of possible locations. The Proxy server then tries successive entries on the list until it meets a success. It then returns the Information to the UAC who communicates directly with the new Proxy Server or UAS. (Not all Proxies have this capability).

• 1. Invite - UAC sends request to the UAS’s Proxy Server
• 2. Moved - The User has moved to another Proxy Server. The Redirect Server returns a a list of possible addresses to the Proxy Server
• 3. Proxy Server - Proxy tries invites to successive proxies from the list
• 4. Invite to New Proxy - Each Proxy returns a failure response (Cancel) until the Old Proxy reaches the one where the User is logged in
• 5. Call complete - to through new Proxy. The User now communicates either with the New Proxy or directly with the UAS

---

Posted by george99