Function switch_jb_get_frames 

pub unsafe extern "C" fn switch_jb_get_frames(
    jb: *mut switch_jb_t,
    min_frame_len: *mut u32,
    max_frame_len: *mut u32,
    cur_frame_len: *mut u32,
    highest_frame_len: *mut u32,
) -> switch_status_t