I currently have a MAXdsl (up to 8Mb) with AAISP, and am looking to
perhaps 'enter' the VOIP arena.

Currently, our voicecalls are routed via Primus (on our BT rented line)
and we also use 18185 for certain calls, I.e. international.

We tend to make a mix of local, national and international calls (the
latter only ever to Cyprus) so I am looking for a cheaper VOIP option
than our current arrangement.

1. Which company is the market leader for domestic VOIP?

2. Are the monthly costs of VOIP likely to be cheaper than Primus/18185?

3. Are the quality of the calls good?

4. Does VOIP use bandwidth which counts towards usage limits insofar as
the ISP is concerned? (that's perhaps my daft question!)

5. Can I use my existing Draytek 2600 router?

6. Can I use my existing DECT cordless phone system?

TIA