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EXAMPLE (parallel) UAC Proxy UAS_1 UAS_2 INVITE INVITE INVITE 18x To tag = UAS_1 18x To tag = UAS_1 18x To tag = UAS_2 18x To tag = UAS_2 4xx To tag = UAS_1 200 To tag = UAS_2 200 To tag = UAS_2 4xx not forwared towards UAC Early dialog with UAS_1 terminated Time during which the UAC still thinks the early dialog with UAS_1 is active |