Hi Giovanni, it works great! tried in windows and linux (linux guest on windows virtualbox host with usb passthru) in windows is very to configure since you can check which ports are used in device manager. in linux is more try and error , when we connect the usb it creates 3 ttyUSB* devices. thanks

---------- Forwarded message ---------- From: Giovanni Maruzzelli <gmaruzz@gmail.com> To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Cc: Date: Fri, 5 Jul 2013 11:49:21 +0200 Subject: Re: [Freeswitch-users] how to configure pin for use in gsmopen ? Hello Luis,

seems your mod_gsmopen cannot open the ttyUSB ports.

This can be because those ports are not accessible from the user FreeSWITCH is running as. Try to run FreeSWITCH as root, and see if it works, or chmod the ttyUSB* to be rw for FreeSWITCH's user.

Or, it can be because those ports are not in a usable state, because were not initialized by Linux. Dongles have a complex machinery bringing them from a USB-disk state to a USB-modem state.

I believe you must at least install usb_modeswitch, and all the udev machinery. I'm not sure those are installed in a minimal centos installation.

So, install the usb_modeswitch package and all related stuff (eg: udev, etc). Or, you can try to compile usb_modeswitch and use it at boot in an /etc/rc.local. usb_modeswitch very useful site is: http://www.draisberghof.de/usb_modeswitch/

Good luck, and let us know.

-giovanni