| 摘要 |
An initial call is setup by a universal port user agent by sending an invitation to the proxy server. The proxy server performs a directory lookup from a back end server to obtain route information to a destination. The route information is passed to the universal port user agent in response and is stored in the universal port user agent. When subsequent calls to the same destination are requested, the subsequent calls can be setup using the stored route information. A universal port user agent performs these call setups. The route information memory is managed based on a number of routes stored and the age of the stored routes. In certain embodiments the calls are setup using the Session Initiation Protocol (SIP).
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