diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleDescription.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleDescription.java
index dbdd31eac..e017d6fd6 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleDescription.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleDescription.java
@@ -39,4 +39,6 @@ public abstract class JingleDescription<D extends JingleContentDescriptionElemen
     }
 
     public abstract void onTransportReady(BytestreamSession bytestreamSession);
+
+    public abstract String getNamespace();
 }
diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleSession.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleSession.java
index 9877ba4f6..81eb580fa 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleSession.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/jingle/components/JingleSession.java
@@ -253,7 +253,17 @@ public class JingleSession {
     }
 
     private IQ handleSessionInitiate(JingleElement request) {
-        return null;
+        JingleDescription<?> description = getSoleContentOrThrow().getDescription();
+        JingleDescriptionManager descriptionManager = jingleManager.getDescriptionManager(description.getNamespace());
+
+        if (descriptionManager == null) {
+            LOGGER.log(Level.WARNING, "Unsupported description type: " + description.getNamespace());
+            return JingleElement.createSessionTerminate(getPeer(), getSessionId(), JingleReasonElement.Reason.unsupported_applications);
+        }
+
+        descriptionManager.notifySessionInitiate(this);
+
+        return IQ.createResultIQ(request);
     }
 
     private IQ handleTransportInfo(JingleElement request) {