FYI, I have uploaded libgsm0710, which is a core GSM 0710 protocol implementation that you can reuse in your projects -- if GPL is no problem for you.
It's getting used in fso-abyss, the next-generation 07.10 multiplexer daemon from freesmartphone.org. It's based on the code found in Qtopia that's shipped in millions of devices -- so that should be quite solid. Cheers, -- :M:
