parser/sdp: distinguish between RFC2543 and RFC3264 media hold type

src/core/parser/sdp/sdp.c

@@ -584,11 +584,11 @@ static int parse_sdp_session(str *sdp_body, int session_num, str *cnt_disp, sdp_
 			if (stream->ip_addr.s && stream->ip_addr.len) {
 				if (stream->ip_addr.len == HOLD_IP_LEN &&
 					strncmp(stream->ip_addr.s, HOLD_IP_STR, HOLD_IP_LEN)==0)
-					stream->is_on_hold = 1;
+					stream->is_on_hold = RFC2543_HOLD;
 			} else if (session->ip_addr.s && session->ip_addr.len) {
 				if (session->ip_addr.len == HOLD_IP_LEN &&
 					strncmp(session->ip_addr.s, HOLD_IP_STR, HOLD_IP_LEN)==0)
-					stream->is_on_hold = 1;
+					stream->is_on_hold = RFC2543_HOLD;
 			}
 		}
 		++stream_num;

src/core/parser/sdp/sdp.h

@@ -32,6 +32,10 @@
 
 #include "../msg_parser.h"
 
+#define      NO_HOLD 0
+#define RFC2543_HOLD 1
+#define RFC3264_HOLD 2
+
 typedef struct sdp_payload_attr {
 	struct sdp_payload_attr *next;
 	int payload_num; /**< payload index inside stream */

src/core/parser/sdp/sdp_helpr_funcs.c

@@ -386,7 +386,7 @@ int extract_sendrecv_mode(str *body, str *sendrecv_mode, int *is_on_hold)
 		(strncasecmp(cp1, "a=recvonly", 10) == 0))) {
 		if ((strncasecmp(cp1, "a=inactive", 10) == 0) ||
 		    (strncasecmp(cp1, "a=sendonly", 10) == 0) ) {
-			*is_on_hold = 1;
+			*is_on_hold = RFC3264_HOLD;
 		} else {
 			return -1;
 		}