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Call Flow in Proxy Mode
In proxy mode, every user agent takes use of proxy to relay its
SIP message. Proxy may query a location database server
about a SIP URL. Depending on the result, it may relay the
request to a next-hop proxy, or send it to the destination peer.
In this flow, Alice is located in atlanta.com. She is going to
place a call to Bob, whose SIP URL is
. Alice's user
bob@biloxi.com
agent passes the INVITE message to its proxy, atlanta.com.
From the request URL in SIP message, Alice's proxy
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