> The company that I work for wants to do a proof of concept VOIP via ADSL.
> Yeah I know ADSL in NZ is not the best for VOIP but it can be done.

I've had a bit of a play with Asterisk and VoIP. It's clearly an early
adopters market. With the limited upstream bitrates, VoIP seems to be
possible.

I've used the non-bitstream access DSL (2meg/192k), and not Xtra as an ISP.

My first attempts were ok, but the voice quality broke up reasonably often.
Once I implemented LLQ (low latency queuing) and LFI (link fragmentation and
interleaving), these problems appear to have gone away. I can
simultaneously have downloads running and the voice quality remains good. I
use Cisco 827/837 routers to terminate the DSL circuit. I imagine these same
techniques could be used by gamers so that there games don't lag when other
members of the household/flat start surfing.

I haven't run VoIP over a VPN, but I would imagine you would still need to
employ QOS.

I have used austech partnerships (ATP) for local access in Australia for a
while (http://www.austechpartnerships.com/atp/). At AU$10 a month, you get a
phone number (I have one in Sydney), and calls to Australian capital cities
are about AU12c flat rate per call.

I have also started using iTalk for a phone line in Auckland
(http://www.italk.co.nz). I have family in Auckland, and it means I can call
them (or they can call me) any time of the day or night as a 'free' local
call. At $10 a month for a phone line in Auckland it looks cheap compared to
other offerings. Plus you get caller id, voice mail, and other services
thrown in. I notice that like the ATP service, the iTalk service supports
multiple concurrent calls.

Greg :-)

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