Simple Vedio Intercom System
I. Deployment / Architecture Block Diagram
II. Resources Used
sip proxy server + sip user agent
1. flexisip / freeswitch + linphone / pjsip / libexosip2 + libosip2 + ortp + mediastream2
III. Each module concrete realization
Maybe you don't need to write a single line of code, because all modules are perfect.
1. flexisip
https://github.com/BelleDonneCommunications/flexisip
2. linphone
http://www.linphone.org/sites/default/files/solutions-intercomsystems.pdf
http://www.linphone.org/sites/default/files/solutions-securedcommunications.pdf
3. freeswitch
4. pjsip
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