Hi, I’m Karel and I have been working as a technical trainer and telecom architect for the last two decades. I’ve worked with big MNOs such as DTAG, Verizon, Vodafone, Optus, Tele2, Telia, Bell, Telcel, to name just a few, but also with smaller operators, MVNOs and enterprises. My main focus is IMS network architecture and the related call flows and services.

In our daily practice or even in product training we usually don’t have enough time to discuss the basics and related specifications, so here I want to share some interesting information. In general all the information here is taken from standards (and mostly confirmed in practice with mobile operators all around the globe). I feel so honored to find some of my explanations in other trainings and documents (including GSMA 😉) , as my goal always has been to help people to understand complex telecom standards. (No harm, if you provide a reference though :))


In order to keep a manageable size of posts I have to brush over some of the (sometimes quite important!) details. I apologize in advance if you find my brief description over-simplistic or inaccurate. If you spot any incorrect or misleading information, please let me know.

Some interesting facts about RTC readers.

Thank you for your visit! Comments appreciated.

To get in touch, use email training-at-realtimecommunication.info or leave a comment.

https://travelingtelcotrainer.wordpress.com/ – photo blog



13 thoughts on “About

  1. Hi Karel, Do you have a direct email address where we can leave you comments/questions? I’d hate to leave questions around the blog randomly.. and I”m not sure if you are alerted to all comments?


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