int _bt_response_and_hold_response(void *t_device,
bt_hfp_agent_error_t err);
int _bt_answer_call_response(void *hs, bt_hfp_agent_error_t err);
int _bt_response_and_hold_response(void *t_device,
bt_hfp_agent_error_t err);
int _bt_answer_call_response(void *hs, bt_hfp_agent_error_t err);