[A*UG] Asterisk as a media server performance?

[Michael Giambalvo]

I've been considering using Asterisk as a media server for a project
I'm working on, and I was wondering how much capacity it can handle.
All I can seem to find on this is the info on
http://www.voip-info.org/wiki-Asterisk+dimensioning

Can anyone give me a general idea on how many calls per
second/concurrent calls asterisk could handle, assuming reasonable
hardware ( ie, 2.8G p4 ), doing some kind of limited IVR and playing
G.711 encoded audio?