VOIP PBX Help

I apologize as I know what I'm asking is probably outside the website scope, but I'm hoping someone would be able to help out.

I have been working on a plan to expand our product lines. When reviewing other systems with customers, inquires for VOIP and wireless networking seem to be the most common. I'm currently reviewing and understanding the VOIP systems/setup, but I have no specific product knowledge yet. My plan is to purchase and set up a demo unit to learn and test in the office. If possible, I'm looking for a system that does not charge yearly licensing fees.

Is there anyone that could recommend a "beginners":

1. IP PBX Software

2. IP PBX Hardware

3. IP PBX Software/Hardware combo (if different)

4. SIP trunk provider

5. IP Phone suggestions (single line, receptionist, conference)

Any thoughts/comments would be appreciated. Thank you.

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