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4.3. PSTN Call Flow

Now that we have discussed what makes up the PSTN, let's put it all together and walk through a messaging sequence. Here we will start from a caller picking up the phone attempting to make a call. The flow will be broken down into off-hook, digit receipt, ring down, conversation, and on-hook sections. We will start by imagining someone (Party B) picking up the phone to make the call (to Party A, on the same CO switch). The following list outlines, in order, the actions performed by the network:

Party B picks up the phone, and the off-hook sequence begins:


  

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