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Tobias Engel t-openbsc at tobias.orgHi, I just pushed a "tobias/csd" branch to both the openbsc and libosmo-abis git. If you check out those branches you should be able to make CSD calls with a BS-11 and the following parameters: V.110, 9.6kbit/s, transparent mode. The AT-Command to activate this mode is AT+CBST=71,0,0. (If you see an ERROR when entering this command, your phone's baseband most likely doesn't support transparent mode. One of the few exceptions seem to be MediaTek and TI.) There is no Interworking Function in the code - the V.110 frames simply get sent from one phone to the other. This should not be a problem as long as both sides use the exact same parameters. The openbsc tobias/csd branch is based on Harald's laforge/csd branch which already adds code for setting CSD channel modes. Many thanks to Dieter Spaar who found out why I was only seeing garbled data on the uplink, and also to GSMK who let me use lots of my time there to figure out this CSD stuff. Next stop would be to implement RLP to also support V.110 non-transparent mode which is supported by almost all GSM basebands. -Tobias