Cellular Network Infrastructure

Hi,

I try to build a 2G GSM Network using OsmoTRX, OsmoBSC, OsmoHLR and other software that are required. But I have a problem I cannot solve. I do this because I wanted to learn how a GSM structure works but I never had experience before. I am using the Ettus USRP B210. So to come to my issue.

In OsmoHLR I can register my subscribers and the 2G activation is done correctly. Bu when I try to register my phones in the Network by selecting the Network I get a message "Network Connection Failed"

Does anyone have a solution. I was thinking maybe I did some mistakes in the configuration.

If someone has a instruction it would be nice

Kind regards