[Asterisk-Users] Calculating required bandwidth

[Ed Greenberg]

I was posed this question:

A T1 set up for voice carries 24 conversations on a circuit that is 1.544 
megabits/second. Right?

Well, if you set that T1 up to carry data and run a link between two IP 
networks over it, how many SIP conversations could it be expected to carry? 
How about IAX?

How would one extend this calculation to varying bandwidth circuits and 
various VOIP protocols (MGCP, SCCP and H323 come to mind)?

Rather than asking for a full education here, can somebody point me at a 
suitable practical reference? Of course, if somebody wants to actually post 
the answer that'd be fine too :)

THanks,
</edg>