don't offer initiator his own candidates

src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java

@@ -399,8 +399,10 @@ public class JingleConnection implements Downloadable {
 	private List<Element> getCandidatesAsElements() {
 		List<Element> elements = new ArrayList<>();
 		for (JingleCandidate c : this.candidates) {
+			if (c.isOurs()) {
 				elements.add(c.toElement());
 			}
+		}
 		return elements;
 	}