Hello, out there,
gsm-ussd 0.1.1 is now available. The script in itself didn't change very much, but installing became easier: If your linux distribution is Debian based (Debian proper, Ubuntu, ...), then you can now simply do a
$ make deb
$ sudo dpkg -i packages/gsm-ussd*.deb
The .tar file will contain a few files more, but if you're not interested in developing gsm-ussd further, you'll only need the Debian package.
Here are the files for download:
Now I'll have to figure out how to build a RPM package...