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Callbacks are invoked from ftdm_span_start/_stop(). I/O is started before SIG and shut down in reverse order. This is needed for ftmod_misdn, to move the mISDN message handling into a separate thread (solving the mISDN socket vs. FreeTDM API issues). With these callbacks, the I/O thread can be started after the span I/O configuration has been (successfully) completed and stopped before destroying the span. NOTE: Both SIG and I/O callbacks are called with the span mutex locked, so threads created or destroyed synchronously in either of the custom start/stop functions, can not use ftdm_span_*() functions that lock the span mutex (e.g. ftdm_span_get_channel_count()). Signed-off-by: Stefan Knoblich <stkn@openisdn.net>