-> interface.conf has a tones_dir options for individual interfaces.
-> interface.conf has priority over tones_dir in options.conf.
-> exnsion's settings has pritority over other tones_dir setting.
+- Debug option now works for GSM.
+- Fixed some GSM information elements.
+- OpenBSC api changes.
+- Fixed disabling of DTMF using 'n' option of chan_lcr.
+- Added GSM IMSI dialing by using dialing "imsi-<number>".
+- Applied API change of OpenBSC.
+