yes i will have a dedicated server capable of running more than 300 calls at once. I dont have it yet im trying to get all my resources together. So if possible I would like to get someone to install it when im ready for it.
If you have a dedicated server, you might consider to install trixbox. You can ask your vendor to download trixbox from its website, burn to a CD and install from there. It's the easiest way.
Or you might want to consider to get a VPS, install trixbox on it, then upgrade to dedicated server when needed. I only have experience on Xen VPS, so I am not sure about other platform, but I have seen someone using trixbox on OpenVZ too.
If you're wanting to run a2billing then, rather than Trixbox, you're probably better off looking at either Elastix (comes with a2billing installed but a farily old version - 1.30) or PBX-in-a-Flash (comes with a script to install A2Billing version 1.34).
SysAdminMan - Asterisk PBX hosting - FreePBX, A2Billing and Elastix