[swinog] Small VoIP PBX recommendations

I'm looking for recommendations on small VoIP PBX systems with these properties:

- works well with Snom, Aastra, and Soft-phones - 10-15 phones - basic admin (web gui) to configure accounts and assign numbers (DDI) - reliable and secure operation - support for uplink SIP trunking (no BRI ports) - log for CDRs to see who cost how much

An opensource solution running on Linux/FreeBSD would be preferred, a small and good complete "hardware" solution for a couple of hundred bucks would acceptable as well. In either case it should be relatively straight forward and low hassle installation and operation.

What would you recommend? Which packages would you rather avoid?

Thanks