I have been doing IP Tel for a long Time and I have always read and been told G729 is around 24 to 32K per call.
But after working with IP to IP gateways and SIP and some very large enterprise customers and talking to TAC this is refering to a single RTP stream from point A to point B then as the converstion changes from point B to A that is a RTP Stream which really makes that one call 64k.
I found out that the Bandwidth Calculator calculates based on a single oneway RTP stream. So when you tell a customer a g729 call is 24 to 32k is not correct it is more like two 32k converstions that in reality make up 64k.
So a 512K CAR will only handle 8 calls at 32k per stream. 512K/64
I hope you are not as confused not as I have become. And why can't the BW Calculators just do the total BW for 8 calls.