obsolete the "symmetric" flag

daemon/call_interfaces.c

@@ -433,8 +433,6 @@ static void call_ng_process_flags(struct sdp_ng_flags *out, bencode_item_t *inpu
 		for (it = list->child; it; it = it->sibling) {
 			if (!bencode_strcmp(it, "trust address"))
 				out->trust_address = 1;
-			else if (!bencode_strcmp(it, "symmetric"))
-				out->symmetric = 1;
 			else if (!bencode_strcmp(it, "asymmetric"))
 				out->asymmetric = 1;
 			else if (!bencode_strcmp(it, "trust-address"))

daemon/sdp.h

@@ -19,7 +19,6 @@ struct sdp_ng_flags {
 	enum stream_direction directions[2];
 	int address_family;
 	int asymmetric:1,
-	    symmetric:1,
 	    trust_address:1,
 	    replace_origin:1,
 	    replace_sess_conn:1,