GSM modem does not create /dev/ttyUSB file

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http://unix.stackexchange.com – I installed Kannel in a server, and I want to use a GSM 3G USB modem to send/receive SMS messages, as described in section SMS Centers > GSM Modem of the Kannel User Guide. I have already installed, configured and tested Kannel on my notebook successfully. When I plug the modem into my notebook, a device named /dev/ttyUSB0 appears. It acts as a serial port to send commands to the modem. I have to put this device in the Kannel configuration file. After some testing, I decided to install Kannel in the production server. The server runs Linux-VServer, and my task is to install Kannel on the h (HowTos)