Hardware needs

Hello guys,

Currently we have PBX system build with CentOS 5.8 and Asterisk 1.8 on HP ProLiant DL380 G7 server. It has two Intel Xeon E5649’s (2.53GHz, 6-core with Hyper Treading), 8 Gigs of RAM and two 10000 RPM 300 GB hard disk drives in RAID 1. Phone network also includes around 150 phones. All calls are being recorded. I spot PBX peaking at 73 concurrent calls without a problem.

So the business is growing and I have a question. What hardware requirements would be to the system in two cases: 300 phones and 150 concurrent (recorded) calls; 600 phones and 250 concurrent (recorded) calls.

Thanks for any advise.

Regards, Volodymyr.

Hello Volodymyr!
It depends on the codec(s) used, could you specify?
You may also use this tool:
Hope this help,


So we are using G.711 codec for all calls.


if you’re not transcoding calls, you need to see what’s causing the peak. I could get away with over 150 phones and 200 calls on a dual core 3.2Ghz / 8GB Ram / 78Gig 72000RPM (Raid0) Dell Poweredge server. Record to ramdisk and then move to onboard drives - might help with your load