'''P'''ublic '''S'''witched '''T'''elephone '''N'''etwork, the network nearly all telephones use to make calls.  When you ask for the number of that cute guy/gal at the pub, you are probably wanting their [PSTN] number.

There are alternate ways to make phone calls, one of which is using [VoIP] to make calls over the internet.  If you wish to place a call from a [VoIP] phone to a [PSTN] phone you will need to use a PSTN gateway service.

! PSTN gateway services
|^| '''Provider''' |^| '''Melbourne%%%POP''' |^| '''Melbourne%%%($/min)''' |^| '''Mobile%%%($/min)''' |^| '''Protocols''' ||
|| (http://www.mibroadband.com.au/ M! Voice) |^| Yes |^| ? |^| ? |^| ? ||
|| (http://www.comindico.com.au/dynamic/eCall/index.html Cominidco eCall) |^| ? |^| ? |^| ? |^| ? ||
|| (http://austechpartnerships.com/atp/ ATP) |^| Yes |^| ? |^| ? |^| [IAX] [SIP] ||