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  1. The receiver (VoipNow) sends a "ced" (Fax answering tone) message
  2. The sender sends a "cng" (Origination fax calling tone) message.
  3. The handshake starts with the receiver sending a "DIS" (Digital Identification Signal) message stating its terminating capabilities.
  4. The sender responds with a "DCS" (Digital Command Signal) message, which indicates the transmission mode that will be used by the sender.
  5. The receiver sends a "CFR" (Confirmation To Receive). This indicates that it's ready to receive the fax.
  6. The sender will now begin to send the fax.
  7. If there are several pages in the fax message, a "MPS" (multipage signal) message will be sent after each page. 
  8. The receiver sends a "MCF" (Message Confirmation) after receiving each page.
  9. Once all pages are sent, an "EOP" (End Of Procedure) message is sent.
  10. The receiver sends a "MCF" (Message Confirmation) indicating that the fax was received.The caller will disconnect the call with a "DCN" (Disconnect) message.

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