a prespecified functional mapping q where mappings p and q are such that p j the mapping change at regular intervals or upon the occurrence of specified events and with each change the communicating the remote source is provided with a different mapped address to be used application_number US 22995408 A description fig3 illustrates a packet network arrangement that comports with the principles of this invention and with respect to those principles it is similar to the fig1 arrangement for illustrative purposes however instead of a single network as shown in fig1 fig3 depicts an atm network 310 and an atm network 320 instead of gateway 10 pstn 100 and user 11 there is an mta 13 that is connected to switch 314 within network 310 and instead of gateway 20 pstn 200 and user 12 there is an mta 23 that is connected to switch 324 within network 320 it is noted that the switches in atm networks perform essentially the same function as do the routers in ip networks in this disclosure therefore the term u201c node u201d is used to subsume both a router and a switch for convenience it may be assumed that mta 13 is in new york and network 310 is owned by verizon that mta 23 is in los angeles and network 320 is owned by pactel and that the connection between networks 310 and 320 is either direct or circuit switched over a network owned.