ring_state        339 src/ftmod/ftmod_wanpipe/wanpipe_tdm_api_iface.h 	int (*wp_ring_detect_event)(sng_fd_t fd, unsigned char ring_state);
ring_state        340 src/ftmod/ftmod_wanpipe/wanpipe_tdm_api_iface.h 	int (*wp_ring_trip_detect_event)(sng_fd_t fd, unsigned char ring_state);