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Approach 3: KPML App Caller sends call through “park server” which is a proxy (msg 1) Park server delivers INVITE to UA 1 (msg 2) Park server uses KPML and subscribes to DTMF events at UA 1 (msg 3) User enters digit sequence for park, reported to park server in NOTIFY (msg 4) Park server performs REFER (not shown) Park Server UA 1 Caller UA 2 1 2 3 4 |