[asterisk-users] PBX selection

[Speed Boy]

 Hi all, I'm new to VoIP, now we have a project that needs a
 PBX with client APPs.
In our team we have argument for choosing PBX. By so far, we
 have following candidates:

A: Open source

     1) Asterisk PBX (http://www.asterisk.org) (with longest
 history that almost every one knows it, now the last version using the
PJSIP stack)
     2) FreeSwitch (http://www.freeswitch.org) (A lot people
 recommended it to us)


B: Commercial

    1) Vodia PBX (http://www.vodia.com). It comes from SNOM, now
acquired by a HongKong company now
    2) PortSIP PBX (http://www.portsip.com/portsip-pbx). It
also includes VoIP SDK, WebRTC and offer rebranding app for free.

My boss prefers the Open Source PBX since they are free,
but our CTO prefers the commercial editions, according to
whom the business PBX has better support, and the
performance is good, and easy to use - considering our team
all are new to VoIP/PBX.

We have did some searching of Asterisk, here are my questions:

1. Does the last Asterisk using PJSIP stack ?
2. Does there has the comparison of PJSIP and reSIProcate, sofia(using by
FreeSwicth) ?
3. Is it easy to compile and setup Asterisk?
4. Which Asterisk version is recommended? And does Asterisk support Windows
?

Thanks in advance .
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