Originally posted by 3pickups:
Thanks Sentrex - regarding the bandwidth, we operate a small office with rarely 3 of 5 lines engaged at any given time.
Primus has told us that one provisioned DSL line will only use the bottom 450KB of available bandwidth and enable us up to seven simultaneous calls (not that we'd ever max that) in crystal clear quality.
Too good to be true?
Yes and no. A toll-quality (uncompressed, g711) call needs 64kb/sec each way, plus another 6-10kb/sec for the overhead. To be absolutely covered figure 140kb/sec per 2-way conversation. BUT. There are voice compression schemes such as g729a that reliably cut the above figure in half. This is not free by the way, you have to purchase licenses, but the cost is minimal.
This is regardless of the VOIP protocol.
I don't have direct experience with Primus, but I've heard good things.
Edit: I should add that the difference in quality between a g711 and a g729a call is zero for most people/circumstances
