Question: How Do I Build a SIP VoIP System?

I’d like to build a VoIP softphone app and as learnt by you, I’d like to use SIP. Problem is, I’d also like to run the server from our office so that even without internet connection, employees can communicate over LAN / WLAN within the offices. Problem is, I’m new to VoIP and really don’t… Continue reading Question: How Do I Build a SIP VoIP System?