You may be interested to note our planned server and hardware revamp for 2008:
VoIP Servers
In/outbound asterisk call processing servers (for iax + newsip) x10 Sip Registration x2 Sip Call routing x3 Mysql database cluster x4 for newsip to back off on Prepay permissions servers x3 Voicemail servers x3
More information available here: http://www.gradwell.com/company/blog/2007/12/21/server-plans-for-2008/
