Every Cisco and Microsoft Teams voice problem eventually becomes a SIP problem. This course gives you a vendor-neutral, engineer-level understanding of SIP, SDP, RTP and the network services that voice depends on.
You will read real SIP traces line by line, build call flows with open-source tools, and learn the troubleshooting method our instructors use on production trunks.
14 h video + 10 h labs, about 3 weeks at 6–8 hours per week.
6 modules · 39 lessons
Hands-on in a browser-based pod. Each lab starts from a clean snapshot.
| # | Lab | Skills | Time |
|---|---|---|---|
| 1 | Capture and decode a basic SIP call | Wireshark, SIP ladder diagrams | 45 min |
| 2 | Build a SIP registrar and place calls between softphones | Registration, digest authentication | 60 min |
| 3 | Diagnose codec negotiation failures (488 Not Acceptable Here) | SDP analysis | 45 min |
| 4 | Fix one-way audio caused by NAT | SDP c= line, RTP flows | 60 min |
| 5 | Measure jitter and loss; apply QoS marking | RTP stream analysis, DSCP | 60 min |
| Exam | Blueprint domain | Weight | Covered in |
|---|---|---|---|
| 350-801 CLCOR v2.0 | Protocols and Endpoints | — | Modules 2–3 |
| 350-801 CLCOR v2.0 | Media and QoS | — | Module 4 |
| MS-721 | Plan and design collaboration communications systems | — | Modules 1, 4–5 |
Principal Instructor, CUBE & SIP Interworking
Priya spent a decade at a Tier-1 carrier integrating enterprise SBCs with SIP trunk services. She teaches dial-peer design, SIP normalisation and troubleshooting from real carrier traces.
Watch before you buy, no sign-up required.
“The trace-reading exercises finally made SIP click. I now open Wireshark first instead of guessing.”
“Exactly the protocol depth I was missing before tackling Direct Routing.”
The bridge from routing and switching to unified communications: UC architecture, Cisco and Microsoft platforms, and your first CUCM configuration.
Pre-CLCOR preparation
Master Cisco Unified Border Element: dial-peer design, SIP normalisation, security, transcoding, high availability and real carrier troubleshooting.
Supports 350-801 CLCOR
The Microsoft Teams voice engineer course: Teams Phone, Direct Routing, Operator Connect, devices, meetings and troubleshooting, mapped to MS-721.
MS-721