VoIP fundamentals

Vendor-neutral SIP, RTP, and call-diagnostic skills for MSP techs.

SIP signalling and RTP media sit underneath every voice ticket. This track takes a tech from 'I don't quite know how VoIP works' to 'I can read a packet capture and tell you why this call failed'. SIP handshakes, SDP and codec negotiation, NAT traversal, Wireshark call-flow diagnostics, and the failure modes you'll see in the field.