dialtone
static struct dialtone tones[] = {
static struct dialtone dialtone = { 350.0, 440.0 };
static struct dialtone reordertone = { 480.0, 620.0 };
static struct dialtone ringingtone = { 440.0, 480.0 };
static struct dialtone silence = { 0.0, 0.0 };
channels, chanmask, dialtone);
unsigned int chanmask, struct dialtone dt)