diff --git a/docs/BuildingLibWebRTC.md b/docs/BuildingLibWebRTC.md
index c1ff6837..67e0df3e 100644
--- a/docs/BuildingLibWebRTC.md
+++ b/docs/BuildingLibWebRTC.md
@@ -20,7 +20,7 @@ $ get_webrtc
 
 * Set a specific *libwebrtc* version:
 ```bash
-$ update2Revision 12558
+$ update2Revision 13311
 ```
 
 
diff --git a/lib/libWebRTC-LATEST-Universal-Release.a b/lib/libWebRTC-LATEST-Universal-Release.a
index d364a59b..be44c38f 100644
Binary files a/lib/libWebRTC-LATEST-Universal-Release.a and b/lib/libWebRTC-LATEST-Universal-Release.a differ
diff --git a/src/webrtc-headers/RTCDTMFSender.h b/src/webrtc-headers/RTCDTMFSender.h
new file mode 100644
index 00000000..7e1f675d
--- /dev/null
+++ b/src/webrtc-headers/RTCDTMFSender.h
@@ -0,0 +1,66 @@
+/*
+ * libjingle
+ * Copyright 2014 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "RTCAudioTrack.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class RTCDTMFSender;
+// Protocol for receving tone change events.
+@protocol RTCDTMFSenderDelegate<NSObject>
+
+// Called when a DTMF tone is played out.
+- (void)toneChange:(NSString*)tone;
+
+@end
+
+// ObjectiveC wrapper for a DtmfSender object.
+// See webrtc/api/dtmfsenderinterface.h
+@interface RTCDTMFSender : NSObject
+
+@property(nonatomic, readonly) BOOL canInsertDTMF;
+@property(nonatomic, readonly) NSString* toneBuffer;
+@property(nonatomic, readonly) NSInteger duration;
+@property(nonatomic, readonly) NSInteger interToneGap;
+@property(nonatomic, weak) id<RTCDTMFSenderDelegate> delegate;
+// The track associated with this DTMF sender. This property
+// returns a copy of the RTCMediaStreamTrack
+@property(nonatomic, copy, nullable) RTCAudioTrack *track;
+
+- (BOOL)insertDTMF:(NSString*)tones withDuration:(NSInteger)duration andInterToneGap:(NSInteger)interToneGap;
+
+#ifndef DOXYGEN_SHOULD_SKIP_THIS
+// Disallow init and don't add to documentation
+- (id)init __attribute__((
+    unavailable("init is not a supported initializer for this class.")));
+#endif /* DOXYGEN_SHOULD_SKIP_THIS */
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/src/webrtc-headers/RTCI420Frame.h b/src/webrtc-headers/RTCI420Frame.h
index 890d4aa6..1d145ee7 100644
--- a/src/webrtc-headers/RTCI420Frame.h
+++ b/src/webrtc-headers/RTCI420Frame.h
@@ -28,6 +28,8 @@
 #import <Foundation/Foundation.h>
 
 // RTCI420Frame is an ObjectiveC version of cricket::VideoFrame.
+// TODO(nisse): It appears it doesn't support any VideoFrame methods,
+// so let it wrap an webrtc::VideoFrameBuffer instead?
 @interface RTCI420Frame : NSObject
 
 @property(nonatomic, readonly) NSUInteger width;
diff --git a/src/webrtc-headers/RTCPeerConnection.h b/src/webrtc-headers/RTCPeerConnection.h
index a13ed3ec..481bbd52 100644
--- a/src/webrtc-headers/RTCPeerConnection.h
+++ b/src/webrtc-headers/RTCPeerConnection.h
@@ -27,9 +27,11 @@
 
 #import "RTCPeerConnectionDelegate.h"
 
+@class RTCAudioTrack;
 @class RTCConfiguration;
 @class RTCDataChannel;
 @class RTCDataChannelInit;
+@class RTCDTMFSender;
 @class RTCICECandidate;
 @class RTCICEServers;
 @class RTCMediaConstraints;
@@ -76,6 +78,9 @@
 - (RTCDataChannel*)createDataChannelWithLabel:(NSString*)label
                                        config:(RTCDataChannelInit*)config;
 
+// Create a DTMF sender.
+- (RTCDTMFSender*)createDTMFSenderForTrack:(RTCAudioTrack*)audioTrack;
+
 // Create a new offer.
 // Success or failure will be reported via RTCSessionDescriptionDelegate.
 - (void)createOfferWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate