Voice call in Local Area Network

[Dilawar]

Hi everyone, 

I want to connect 40 computers in local area network where they could call and talk to each other without using internet.

It should be two way communication where all can take part in discussion. This whole setup will be in single room.  

Its a kind of conference call but no video is required only voice communication.

Looking forward for solution.

Thank you

[Jaime Valencia]

Cisco solutions rely on either CME or CUCM for call control.

CUCM would be able to handle 40 calls in a SW CFB, on CME, you would need to add PVDMs to meet that requirement.

[Dilawar]

Thank you for your reply sir.

But i think this is not what i want to do or i have not elaborated issue clearly. Let me explain a bit more.

I want something like this in image.

All the students will have headphones and be able to talk to teacher and each other openly just like we do in skype group call without any token system. I want voice communication through headphones.

Thank you