#define BT_HF_FEATURE_ENHANCED_CALL_STATUS 0x0020
#define BT_HF_FEATURE_ENHANCED_CALL_CONTROL 0x0040
#define BT_HF_FEATURE_CODEC_NEGOTIATION 0x0080
#define BT_HF_FEATURE_ENHANCED_CALL_STATUS 0x0020
#define BT_HF_FEATURE_ENHANCED_CALL_CONTROL 0x0040
#define BT_HF_FEATURE_CODEC_NEGOTIATION 0x0080