diff --git a/media/base/media_constants.cc b/media/base/media_constants.cc
index f91ac33..2f29a20 100644
--- a/media/base/media_constants.cc
+++ b/media/base/media_constants.cc
@@ -44,6 +44,7 @@
 const char kCodecParamNotInNameValueFormat[] = "";
 
 const char kOpusCodecName[] = "opus";
+const char kIsacCodecName[] = "ISAC";
 const char kL16CodecName[] = "L16";
 const char kG722CodecName[] = "G722";
 const char kIlbcCodecName[] = "ILBC";
diff --git a/media/base/media_constants.h b/media/base/media_constants.h
index ca3213e..f843d50 100644
--- a/media/base/media_constants.h
+++ b/media/base/media_constants.h
@@ -45,6 +45,7 @@
 extern const char kCodecParamNotInNameValueFormat[];
 
 extern const char kOpusCodecName[];
+extern const char kIsacCodecName[];
 extern const char kL16CodecName[];
 extern const char kG722CodecName[];
 extern const char kIlbcCodecName[];
diff --git a/media/engine/payload_type_mapper.cc b/media/engine/payload_type_mapper.cc
index 66c48a7..c63d1d7 100644
--- a/media/engine/payload_type_mapper.cc
+++ b/media/engine/payload_type_mapper.cc
@@ -62,6 +62,8 @@
            // Payload type assignments currently used by WebRTC.
            // Includes data to reduce collisions (and thus reassignments)
            {{kIlbcCodecName, 8000, 1}, 102},
+           {{kIsacCodecName, 16000, 1}, 103},
+           {{kIsacCodecName, 32000, 1}, 104},
            {{kCnCodecName, 16000, 1}, 105},
            {{kCnCodecName, 32000, 1}, 106},
            {{kOpusCodecName,
diff --git a/media/engine/payload_type_mapper_unittest.cc b/media/engine/payload_type_mapper_unittest.cc
index 92253a0..90e113c 100644
--- a/media/engine/payload_type_mapper_unittest.cc
+++ b/media/engine/payload_type_mapper_unittest.cc
@@ -50,6 +50,8 @@
   // Tests that the payload mapper knows about the audio formats we've
   // been using in WebRTC, with their hard coded values.
   EXPECT_EQ(102, mapper_.FindMappingFor({kIlbcCodecName, 8000, 1}));
+  EXPECT_EQ(103, mapper_.FindMappingFor({kIsacCodecName, 16000, 1}));
+  EXPECT_EQ(104, mapper_.FindMappingFor({kIsacCodecName, 32000, 1}));
   EXPECT_EQ(105, mapper_.FindMappingFor({kCnCodecName, 16000, 1}));
   EXPECT_EQ(106, mapper_.FindMappingFor({kCnCodecName, 32000, 1}));
   EXPECT_EQ(111, mapper_.FindMappingFor(
diff --git a/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm b/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm
index 6201e57..753667b 100644
--- a/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm
+++ b/sdk/objc/api/peerconnection/RTCRtpCodecParameters.mm
@@ -21,6 +21,7 @@
 const NSString * const kRTCUlpfecCodecName = @(cricket::kUlpfecCodecName);
 const NSString * const kRTCFlexfecCodecName = @(cricket::kFlexfecCodecName);
 const NSString * const kRTCOpusCodecName = @(cricket::kOpusCodecName);
+const NSString * const kRTCIsacCodecName = @(cricket::kIsacCodecName);
 const NSString * const kRTCL16CodecName  = @(cricket::kL16CodecName);
 const NSString * const kRTCG722CodecName = @(cricket::kG722CodecName);
 const NSString * const kRTCIlbcCodecName = @(cricket::kIlbcCodecName);