Last year Jacob and me worked on the osmo-sgsn of OpenBSC. We have improved the stability and reliability of the system and moved it to the next level. By adding the GSUP interface we are able to connect it to our commercial grade Smalltalk MAP stack and use it in the real world production GSM network. While working and manually testing this stack we have not used our osmo-pcu software but another proprietary IP based BTS, after all we didn’t…
I ended up needing to configure FreeSWITCH to use a Sangoma ISDN card. At first we were foolish and used the setup script to install libraries into our system. Cleaning up It took dpkg -S and manual filtering to clean this mess. On a debian system there are files in /usr/ that do not belong to packages, these can be links to /etc/alternatives, or in case of python be bytecode files (*.pyc). Second attempt with building packages The next attempt…
In the last couple of weeks I was traveling, searching a flat (a total failure so far), working on the Android Project, something else and of course GSM. I am having fun kicking another blackbox and try to figure out why it is catching fire and starts burning. We assume this is related to GPRS (that got recently added to OpenBSC thanks to the sponsoring of On Waves) and something within the UDP messages we send. Now the GPRS protocol…
Yesterday I had the pleasure of trying OpenBSC on a real network and the result was desaster, but honestly what else to expect when trying it the first time. It is not that OpenBSC was crashing, leaking memory, or not recovering from failure it is just the load of the network was differrent than what I assumed and that leads to problems. What happens is one is seeing a lot of location updating requests, which will load the SDCCH but…
This week I had to make parts of OpenBSC work with TCH/H and use AMR. This work is needed for On Waves and when I say parts I mean the strict BSC subset of OpenBSC (in contrast to make the MSC code we have work as well). The first part is to make TCH/H work and that was easy as LaF0rge did almost everything to make it work. You have to change the OpenBSC configuration to use TCH/H instead of…