Turn IT skills into a valuable, recurring-revenue business. The MSP model, the tech stack, pricing, operations (NOC, help desk,...

Stop the attacks that cost real money. Map the VoIP attack surface, encrypt SIP & RTP, prevent and detect toll fraud, harde...

Turn risky production changes into safe, repeatable Methods of Procedure. Anatomy of a MOP, exact steps, risk & windows, ro...

Administer the carrier-grade platform behind hosted PBX. Architecture, the system hierarchy, provisioning, call-control service...

From cloud phone systems to full contact centers: UCaaS features, IVR & ACD routing, omnichannel CCaaS, CRM integration, an...

The network makes or breaks every call. Learn QoS (DSCP/LLQ), voice VLANs & PoE, bandwidth & call admission control, an...

Bring your own carrier to Microsoft Teams. Learn Teams Phone’s PSTN options, Direct Routing architecture, SBC setup &...

Start here: understand how phone calls really work — from the PSTN to packet voice, codecs, call flow, voice quality and the ne...

Go beyond the basics: design, secure, and troubleshoot enterprise SIP trunks and Session Border Controllers — authentication, n...

Master the protocol behind every modern phone system. From PSTN to SIP, SDP, RTP, NAT, SBCs, trunking, security and real-world ...