SIP is very much the mainstream VoIP protocol and one of our most popular courses is on basic SIP Essentials. As VoIP permeates (takes over) the whole world it makes sense that engineers who come from a pure IP data background might need to appraise themselves of how voice works over their now homogeneous networks.
The type of content you will see in this course includes:
TCP/IP protocol, VoIP protocols and SIP, SIP Methods and Responses, SIP Headers etc etc etc. All really good stuff and which should be of interest even to someone who thinks they are up to speed on SIP but maybe could do with a refresher.