In general, 
Asterisk and freeswitch are telephony servers like traditional PBXs but with a lot of features and transport is carried over internet protocol (VOIP)

TrixBox is a GUI version of Asterisk
http://www.voipfon.com.ar/66-trixbox_status.jpg.jpg

SER, OpenSER: 
these are Sip express routers that only deal with sip messages and can provide features like voicemail, call recording etc. They are often used for scaling Asterisk and Freeswitch at large (for thousands of calls)  

no good idea about others.

Regards,
Zohair Raza



On Tue, Jan 3, 2012 at 5:58 PM, Kaushal Shriyan <kaushalshriyan@gmail.com> wrote:


On Tue, Jan 3, 2012 at 7:23 PM, Zohair Raza <engineerzuhairraza@gmail.com> wrote:
Hi Zohair

I was interested in some sort of comparison sheet and its advantages over each other.

Regards

Kaushal

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