Progress on OpenBSC

After an intense weekend of hacking, I have made once again quite significant progress with regard to OpenBSC:

• ip.access nanoBTS support is now as good as BS-11 support, i.e. there is no functional difference between what you can do with either of those two BTS types
• As part of this work, A wireshark dissector for ip.access Abis-over-IP as well as some protocol documentation have been created
• simplistic call switching is implemented. This means that you can now register multiple phones to the network, and calls dialled to the extension numbers indicated in the SQL tables will result in paging and ringing of the respective recipient phone. However, voice data is still not routed, even after you pick up the phone.
• internal infrastructure work. OpenBSC now have a TLV parser together with data structures defining the TLV types for every IE in RSL, 04.08 and OML, as well as an internal signalling mechanism where some parts of the code can issue signals while other parts can listen for those signals

This means we're getting very close to being not just an experimental playground but actually doing something useful (like: actual voice calls) soon. SMS switching should also be really easy, in fact much easier than voice call switching. We can already send and receive SMS, but not yet route them through.

Other things on the to do list are: Switch to talloc as memory allocator, cleaning up a lot of the quickly hacked together code, looking for refcount and other resource leaks.

I also want to add an interactive 'Cisco-style' telnet interface for configuration, administration as well as debugging, utilizing the vty code from the quagga codebase

Thanks also once again to zecke for all his help. It's good to not have to care about everything, and just be able to use the working paging layer.