剛剛再看了一下OBiDeviceAdminGuide, "At present an OBi device supports only 1 session of AA at a time. Additional calls routed to the AA while a session is in progress will be rejected by the AA as busy.". 看來我還是要用回原來的計劃, SP2 to SP1 through AA, PSTN to OBiTalk.
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