add SDP management for Re-Invite and reply

Author: mwolff44

src/sip/kamailio.cfg

@@ -518,9 +518,9 @@ route[WITHINDLG] {
 		if (is_method("BYE")) {
 			setflag(FLT_ACC); # do accounting ...
 			setflag(FLT_ACCFAILED); # ... even if the transaction fails
-		} else if ( is_method("ACK|UPDATE") ) {
+		} else if ( is_method("ACK|INVITE|UPDATE") ) {
 			# ACK is forwarded statelessly and UPDATE will be used to update the SDP INVITE in dialog
-			if (is_method("UPDATE")) {
+			if (is_method("INVITE|UPDATE")) {
       	        route(RTPE);
 			}
 			route(NATMANAGE);
@@ -849,6 +849,16 @@ onreply_route[MANAGE_REPLY] {
 		route(NATMANAGE);
     }
 
+	if (has_body("application/sdp")) {
+		if (route(MSG_RECV_EXTERNAL)) {
+			xinfo("rtpe answer from external\n");
+			rtpengine_answer("replace-origin replace-session-connection direction=external direction=internal");
+		} else {
+			xinfo("rtpe answer from internal\n");
+			rtpengine_answer("replace-origin replace-session-connection direction=internal direction=external");
+		}
+	}
+
 	return;
 }