That Simple?
No!! Imagine paying for Internet Access, by Traceroute. VoIP is incompatible with PSTNs’ charge model
PSTNs traditionally (Graham Bell Era) stuff a single call on a single cable pair … and charge for 1 pair!
PSTNs now stuff multiple calls on a single cable pair using a technique called Time Division Multiplexing (TDM) and charge as multiple pairs!!
- BRI, PRI, ISDN, E1 T1 etc are all TDM technologies with diverse switching and Trunking technologies