Hi, I'm relatively new to Asterisk and would like to set up an Asterisk box as a PBX for a large organization and also as a switch for a small community so I have a few questions Which if the various flavors of Asterisk is preferred for setting up a 100-user PBX and which is preferred for setting up a 1000-user PBX? Will Asterisk scale to 1000 PBX users, and what type of hardware would be required to achieve this on the X86 platform? Will using gateways like the Quintum A and D series boxes as opposed to plugging TDM cards directly into the Asterisk box improve the scalability of Asterisk, and will I still have to buy G.729a licenses for Asterisk if it is only used as a switch for SIP gateways and phones? What is a good low cost TDM gateway? What is the best solution for user authentication for a small 100-user setup and also for a large 1000-user setup? Can Asterisk be used as a switch for a 10,000-user network? What hardware, billing and authentication systems do you recommend? If I want to implement SS7 signaling to another telco, what gateway solution can I use with Asterisk? Thanks in advance for answering my numerous questions Femi