diff --git a/src/hfp.h b/src/hfp.h
index b54de566..0d36ae51 100644
--- a/src/hfp.h
+++ b/src/hfp.h
@@ -45,6 +45,24 @@ enum hfp_hf_feature {
 	HFP_HF_FEATURE_CODEC_NEGOTIATION =	0x80,
 };
 
+enum hfp_sdp_hf_features {
+	HFP_SDP_HF_FEATURE_ECNR =			0x1,
+	HFP_SDP_HF_FEATURE_3WAY =			0x2,
+	HFP_SDP_HF_FEATURE_CLIP =			0x4,
+	HFP_SDP_HF_FEATURE_VOICE_RECOGNITION =		0x8,
+	HFP_SDP_HF_FEATURE_REMOTE_VOLUME_CONTROL =	0x10,
+	HFP_SDP_HF_FEATURE_WIDEBAND_SPEECH =		0x20,
+};
+
+enum hfp_sdp_ag_features {
+	HFP_SDP_AG_FEATURE_3WAY =			0x1,
+	HFP_SDP_AG_FEATURE_ECNR =			0x2,
+	HFP_SDP_AG_FEATURE_VOICE_RECOG =		0x4,
+	HFP_SDP_AG_FEATURE_IN_BAND_RING_TONE =		0x8,
+	HFP_SDP_AG_FEATURE_ATTACH_VOICE_TAG =		0x10,
+	HFP_SDP_AG_FEATURE_WIDEBAND_SPEECH =		0x20,
+};
+
 /* Supported agent codecs */
 enum hfp_codec {
 	HFP_CODEC_CVSD = 0x01,