4 Oct
2012
4 Oct
'12
10:10 a.m.
On Tue, Oct 02, 2012 at 05:23:28PM +0200, Peter Stuge wrote:
Hi Yann,
Start looking at the source code. Pick some entry point for a message
that you understand. Follow the call graph through the source code,
to learn about the data flow in OpenBSC. You will quickly find what
the difference is between OpenBSC and a conventional BSC.
Hi,
on top of that the "BSC API"[1] is a good way to start to look at. There
are currently two implementations. One for the NITB and one for the classic
BSC. The NITB will handle the MSC/AuC/HLR/VLR functionality by direct
function calls, the BSC will pack the data into GSM08.08 BSSMAP and send it
to a MSC using SCCP-lite (SCCP on the IPA protocol). To use the "classic BSC"
one needs a real MSC to connect to. My Smalltalk implementation is not
very mature yet.
holger
[1] http://cgit.osmocom.org/cgit/openbsc/tree/openbsc/src/libbsc/bsc_api.c