1. This would be determined by how many of the 100 users would be behind the PBX, and how many would need to register IP phones to a Cisco call agent. If they are all behind the PBX, you do not need a CME/CUCM. < 100 = CME. 100 < x < 250 CUCMBE, x > 250, CUCM, etc
2/5. 2811 or 2821 should be sufficient for an E1 and some analog lines. PVDM2-64, plus VIC2-2FXO for analog lines. VWIC-MFT-E1 card for E1.
3. You would need to determine this based on the IP PBX. It will either be SIP or H323, and you can use IP.
4. No clue - work with IP PBX vendor.
I would highly suggest finding a local Cisco sales office or Partner to help you with the build out, and getting exact part numbers.
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