Hi, My system is Dell XPS L501 and I have installed Ubuntu 10.10 Desktop version on it. The bit I am trying to achieve is to make call to gsm mobile from ubuntu using my gsm mobile (HTC HD2 with T-Mobile-UK SIM card) attached to my Ubuntu 10.10 system via USB. I have followed the below process: I have installed FreeSwitch and verified its functionality with Twinkle (able to access the predefined basic IVR). command: sudo /usr/local/freeswitch/bin/freeswitch -waste I have then built/installed the gsmopen as described on http://wiki.freeswitch.org/wiki/GSMopen and loaded module. freeswitch@saeed-XPS-L501X> load mod_gsmopen 2011-03-22 07:41:47.623806 [WARNING] mod_gsmopen.cpp:1861 rev exported[(nil)|37 ][WARNINGA 1861 ][interface1][-1, 0, 0] STARTING interface_id=1 open error : No such file or directory 2011-03-22 07:41:48.622951 [ERR] mod_gsmopen.cpp:1892 rev exported[(nil)|37 ][ERRORA 1892 ][interface1][-1, 0, 0] gsmopen_serial_init failed 2011-03-22 07:41:48.622951 [ERR] mod_gsmopen.cpp:1893 rev exported[(nil)|37 ][ERRORA 1893 ][interface1][-1, 0, 0] STARTING interface_id=1 FAILED 2011-03-22 07:41:48.622951 [ERR] mod_gsmopen.cpp:3136 rev exported[(nil)|37 ][ERRORA 3136 ][interface1][-1, 0, 0] ALARM on interface interface1: 2011-03-22 07:41:48.622951 [CONSOLE] switch_loadable_module.c:900 Successfully Loaded [mod_gsmopen] 2011-03-22 07:41:48.622951 [NOTICE] switch_loadable_module.c:144 Adding Endpoint 'gsmopen' 2011-03-22 07:41:48.622951 [NOTICE] switch_loadable_module.c:272 Adding API Function 'gsm' 2011-03-22 07:41:48.622951 [NOTICE] switch_loadable_module.c:272 Adding API Function 'gsmopen' 2011-03-22 07:41:48.624943 [NOTICE] switch_loadable_module.c:272 Adding API Function 'gsmopen_boost_audio' 2011-03-22 07:41:48.624943 [NOTICE] switch_loadable_module.c:272 Adding API Function 'gsmopen_dump' 2011-03-22 07:41:48.624943 [NOTICE] switch_loadable_module.c:272 Adding API Function 'gsmopen_sendsms' 2011-03-22 07:41:48.624943 [NOTICE] switch_loadable_module.c:377 Adding Chat interface 'SMS' The interface1 is the default interface (from gspopen.conf.xml) <interface id="1" name="interface1"> <param name="hold-music" value="$${moh_uri}"/> <param name="dialplan" value="XML"/> <param name="context" value="default"/> <param name="destination" value="5000"/> <param name="alsacname" value="plughw:1"/> <param name="alsapname" value="plughw:1"/> <param name="controldevice_name" value="/dev/ttyACM0"/> </interface> I am new user to this system (freeswitch+gsmopen) so please can someone put me in the right direction. These errors are probably due to the fact that there is no /dev/ttyACM0 (as I couldn't list this device). Now as a workaround I was thinking if I can find where my HTC HD2 phone got connected e.g. ttyUSB0 etc then I can create a soft link and can proceed but the trouble is that I can't find the which device it is connected to though i can see the phone via lsusb (it is on Bus 003 and device 005) Bus 003 Device 005: ID 0bb4:0b40 High Tech Computer Corp. Bus 003 Device 004: ID 04f3:0212 Elan Microelectronics Corp. Laser Mouse Bus 003 Device 003: ID 0603:00f2 Novatek Microelectronics Corp. Further information is I was able to use internet out of the box when phone is connected (and I opted for the option internet sharing on my phone). Any recommendation how should I proceed further on this will be very helpful. Please let me know if I need to provide any further information. Many thanks. Kind regards,