Thanks for the info Steve & Johnny99. I was clearly given incorrect information by Vodafone. So I guess that unless our internet is upgraded then our whole community will receive less than satisfactory quality speech.
That assumption is about as far from the truth as you can get.
Quality of a VoIP call is identical to that of analogue - it uses the very same G.711 codec as existing TDM voice calls and you'll have the very same MOS scores in a well engineered network.
There are already large numbers of people using Chorus PSTN emilation via the ISAM-V cards who would be completely oblivious to the fact they're on VoIP not a NEAX.
I would of thought the codecs were different or just a long copper line degrades the voice call.
Example being I changed my parents over from POTS to Spark Wireless which uses VoIP over LTE, they were very quick to say the sound qual of calls big time improved.