pub unsafe extern "C" fn switch_channel_bind_device_state_handler(
function: switch_device_state_function_t,
user_data: *mut c_void,
) -> switch_status_tpub unsafe extern "C" fn switch_channel_bind_device_state_handler(
function: switch_device_state_function_t,
user_data: *mut c_void,
) -> switch_status_t