Thanks Giovanni. I will try with alternative PC (afraid that I don't have a server handy), and with external powered USB2.0 hub (good quality one). Probably with try to get hold of alternate dongle as well.

Since people have managed to get such rigs working with puny hardware like RaspberryPi, I feel that I am perhaps missing some very fundamental step somewhere, or is a case of plain bad luck with the particular hardware I procured.

On Tue, Sep 10, 2013 at 3:41 AM, Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:

You probably have hardware problems in your platform usb subsystem. Can be power supply, can be chipset, can be whatever. Seems evident to me you continue to encounter platform stability problems and ou expect they go away ;).
I would just use a real hardware server, with 64 bit debian, and be happy.
Or be prepared to debug platform hardware prolems, not depending from mod-gsmopen.
This is my feeling. Obviously, I can be wrong.
-giovanni

On Sep 9, 2013 11:19 PM, "Jayanth Acharya" <jayachar88@gmail.com> wrote:

Recently I replaced my Huawei E1550 with a Huawei E173-U2 modem. Both modems are completely unlocked (and voice enabled), with latest firmware files, as per dc-files.com site. While with Huawei E1550, I was having this terrible voice-quality issue, with Huawei E173-U2, I fared much better initially (last night), and my first call went through perfectly, and I got connected to the IVR menu "5000". However, since I was facing signal-quality issues, I used AT^SYSCFG to set the modem to 2G mode, and got excellent signal. Apart from that, I don't remember making other changes, but since this morning, I am getting this 100% repeatable problem, where-in, once I call FS via my mobile, I see the usb-modem attached to FS (gsmopen EP) ringing, and get connected, but I do not hear the IVR menu anymore, but complete silence. After a while the call disconnects, and then I see console log indicating that my /dev/ttyUSB2 (control port) is probably dead, and as a result the /dev/ttyUSB1 and /dev/ttyUSB2 are removed, and /dev/ttyUSB3 and /dev/ttyUSB4 are created. If I reconfigure gsmopen.conf.xml file to use the new audio and control ports, and place another call, the same thing repeats. I've attempted this across several reboots, but is 100% repeatable.

What I see in the console log:
http://pastebin.com/swnz4sWf

The relevant portion of the freeswitch.log file:
http://pastebin.com/dNkhaGen

Any ideas / clues as to what's up ? I tried going through the log file, and what I figured is that nothing seems to be received by FS on the audio port, and eventually /dev/ttyUSB2 becomes unresponsive, i.e. doesn't respond to AT-commands. Not sure though.

- Jay

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