NBN
NBN themselves do not sell phone lines, but the RSP can provide them via your router in some cases
this isn't advisable for phonesystem use. a poor setup from the RSP can result in features previously taken for granted not working. including not recognising the tones of your phone lines for phone tech support
VoIP
Voice over Internet Protocol, VoIP is the most advanced and the most complex line technology yet. this has lead to bad installations tarnishing it's name for some. but a phone call to us can set your mind at ease. our office has been using voip exclusively for almost as long as VoIP has existed without any cause for concern.
PSTN
Public switched telephone network, very few people still have this technology but if you do we can maintain your end of it.
ISDN
Integrated Services Digital Network, digital phone lines who's days have passed but are still mildly superior to PSTN
GSM, 3G, 4G etc
The various forms of cellular network lines, through specialised adaptors these can also be used as landlines. Most commonly seen running elevators