SIP Client Gateway H.323 Termin – – – – INVITE To: Terminal @H323.net C=IN IP4 123.45.6.7 maudio 8000 RTP/AVPO Setup faststart (logical chan info = G711 TX. G711 RX 123.45.6.7.8000 Alerting 180 (Ringing) – – – – – Connect faststart (logical chan info = G711 TX, G711 RX 123.67.8.9:2000 200 (OK) To: Terminal@H323.net CHIN IP4 123.67.8.9 m-audio 2000 RTP/AVPO Two-way voice Two-way voice Explain the details the message exchange in the figure above