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Figure 1 - Privacy in (mobile) Telecommunications Services

Figure 1, the process of making a telephone call A telephone call starts with picking up the phone [step (0) in figure 1] and ends when either side puts the horn down [step (4)]. By picking up the phone a connection is made to the telephone exchange (called the home exchange). In step (1) the caller dials a phone number that is used by the home exchange to determine a route towards the destination; the exchange then attempts to contact the destination exchange (possibly via several intermediate steps). The destination exchange triggers the ring tone of the destination terminal (phone). Step (2) starts when the called party answers the phone. Stepwise the connection is set up starting at the destination along the route determined in step (1) (but in reversed order) to the caller. In step (3) the connection is used: the two parties have their conversation or whatever. In step (4) after the horn is put down at either side, the lines used for the connection are one by one released.  
, the process of making a telephone call A telephone call starts with picking up the phone [step (0) in figure 1] and ends when either side puts the horn down [step (4)]. By picking up the phone a connection is made to the telephone exchange (called the home exchange). In step (1) the caller dials a phone number that is used by the home exchange to determine a route towards the destination; the exchange then attempts to contact the destination exchange (possibly via several intermediate steps). The destination exchange triggers the ring tone of the destination terminal (phone). Step (2) starts when the called party answers the phone. Stepwise the connection is set up starting at the destination along the route determined in step (1) (but in reversed order) to the caller. In step (3) the connection is used: the two parties have their conversation or whatever. In step (4) after the horn is put down at either side, the lines used for the connection are one by one released.  
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