Some USB dongles with some firmware versions can sometimes spontaneously reboot or even freeze. In case of reboot, for host system it looks like modem has been unplugged and then plugged back. You can check kernel log (usually /var/log/kern.log in ubuntu) for related messages from USB subsystem. Device files /dev/ttyUSB* doesn't have any stable numbering scheme, especially when multiple USB-Serial adapters (or modems) connected to system. You can use symlinks from /dev/serial/by-id or /dev/serial/by-path if you wish stable device paths. Unfortunately, most vendors doesn't assign serial numbers to their dongles, so by-id/ not usable when you have more than one dongle from one vendor with same model name. Symlinks in by-path/ should be stable when connecting devices directly to motherboard USB ports without any USB hubs, but I'm not quite sure in that... Also, mod_gsmopen from 1.2.3 doesn't work with long device names, here is the bugreport with patch: http://jira.freeswitch.org/browse/FS-4691. 31.10.2012 19:46, Yihui Li пишет:
Hi,
I am using gsmopen on ubuntu 12.04LTS. With E169 dongle connected as ttyUSB0, ttyUSB1 and ttyUSB2. It runs well at first. But after days, all call failed. Checked the tty files, the ports on system is somehow changed to ttyUSB0, ttyUSB1 and ttyUSB3. ttyUSB2 just disappeared. Does anyone meet the same problem? How can I make it stable? Thanks.
Regards, Eric
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