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Refertotheexhibit.WhatisthesequenceofeventswhenaVoIPcallisplacedfromIPphoneP1toIPphoneP2?()

A.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.IPphoneP1alertstheCCMofoff-hookstate.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1passesdigitstoCCM.CCMroutescalltoPSTNorIPphoneP2.

B.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1alertstheCCMofoff-hookstate.IPphoneP1passesdigitstoCCM.CCMroutescalltoPSTNorIPphoneP2.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.

C.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1alertstheCCMofoff-hookstate.IPphoneP1passesdigitstoCCM.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.CCMroutescalltoPSTNorIPphoneP2.

D.IPphoneP1alertstheCCMofoff-hookstate.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1passesdigitstoCCM.CCMroutescalltoPSTNorIPphoneP2.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.

参考答案

更多 “ Refertotheexhibit.WhatisthesequenceofeventswhenaVoIPcallisplacedfromIPphoneP1toIPphoneP2?() A.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.IPphoneP1alertstheCCMofoff-hookstate.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1passesdigitstoCCM.CCMroutescalltoPSTNorIPphoneP2.B.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1alertstheCCMofoff-hookstate.IPphoneP1passesdigitstoCCM.CCMroutescalltoPSTNorIPphoneP2.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.C.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1alertstheCCMofoff-hookstate.IPphoneP1passesdigitstoCCM.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2.CCMroutescalltoPSTNorIPphoneP2.D.IPphoneP1alertstheCCMofoff-hookstate.CCMinstructsIPphoneP1toprovidedialtone.IPphoneP1passesdigitstoCCM.CCMroutescalltoPSTNorIPphoneP2.RTPtrafficisexchangedbetweenIPphoneP1andIPphoneP2. ” 相关考题
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