I ended up in building the solution myself.

here I publish some work-in-progress details if you're interested:

http://txlab.wordpress.com/tag/pbx/

Also I'll be glad to use my new knowledge for someone's project if there's a need for a similar solution.

From: Stanislav Sinyagin <ssinyagin@yahoo.com>
To: "swinog@swinog.ch" <swinog@swinog.ch>
Sent: Tuesday, September 6, 2011 11:04 AM
Subject: [swinog] looking for a virtual PBX provider

hi all,

I'm building a technical infrastructure for a new on-call support service. This will require a virtual PBX where the support engineers would login and manage the hotline redirection to their personal PSTN or SIP destinations.

Those interested in providing such a service, please contact me off-the-list, and I'll send you detailed technical requirements.

cheers,
stan

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