Switching to TCH

Have you even _read_ the code of layer23 ... it _will_ not do what you want directly. It's a starting point, but you're gonna have to learn to write things by yourself. Well it's a perfectly normal behavior that after some time you only see lost frames. I suggest you re-read the code and the specs until you understand _why_ it's normal. Not out of the box, as I said, you will need to do some programming. Given the question you ask, you obviously don't understand GSM or the code enough yet to do it. Cheers, Sylvain PS: Please don't hijack a thread that has nothing to do with what you're writing about by just clicking the reply button and not even bothering to change the subject ... seems like you need to read the emails RFC as well ...