Hi
My goal also to find Multitenant PBX solution, with good call distribution functions.
All PBX functions should be automated and friendly, (example: creating extension - two steps : Click “New”, and click “Save”, creating new tenant in two steps - click ‘New’, put name and click “OK” )
mentioned above pbx lacks friendly user interface, no documentation and a little confusing XML configuration. thirdline is costly.
Ended up with my own multitenant implementation based on asterisk and ajax GUI