SIP (Session Initiation Protocol) Courses
Pluralsight Troubleshooting Cisco SIP Trunks, CUBEs, and URI Dial Plans
Pluralsight Cisco Collaboration Fundamentals: Providing Endpoint Features, Mobility, and PSTN Access with ISDN and SIP
Pluralsight Introduction to SIP
Udemy Understanding and Troubleshooting SIP
Udemy