[Freeswitch-users] How many Calls??

I built my server with Dual Dual Core XEON 5030 2.67Ghz CPUS. So the hernel sees this as 8 way SMP because each core is Hyper threading. The machine also has 8GB of DDR2 memory and a $300GB RAID10 SATA Array. I am curious as to how many simultaneous SIP calls this should be able to handle. Anyone have a guess?