diff --git a/daemon/sdp.c b/daemon/sdp.c
index a83738cdb..001502540 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -292,6 +292,7 @@ struct sdp_attribute {
 		int i;
 		struct attribute_t38faxudpecdepth t38faxudpecdepth;
 		struct attribute_t38faxratemanagement t38faxratemanagement;
+		enum sdp_attr_type other;
 	};
 };
 
@@ -1768,6 +1769,7 @@ static struct sdp_attr *sdp_attr_dup(const struct sdp_attribute *c) {
 
 	str_init_dup_str(&ac->strs.name, &c->strs.name);
 	str_init_dup_str(&ac->strs.value, &c->strs.value);
+	ac->type = c->other;
 
 	return ac;
 }
diff --git a/include/sdp.h b/include/sdp.h
index c05c42b8d..f282db032 100644
--- a/include/sdp.h
+++ b/include/sdp.h
@@ -34,8 +34,13 @@ struct sdp_attribute_strs {
 	str key;	/* "rtpmap:8" */
 };
 
+enum sdp_attr_type {
+	SDP_ATTR_TYPE_UNKNOWN = 0,
+};
+
 struct sdp_attr {
 	struct sdp_attribute_strs strs;
+	enum sdp_attr_type type;
 };