[Freeswitch-users] mod_gsmopen: call connects, silence, lose /dev/ttyUSB2...

[Jayanth Acharya]

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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