diff --git a/src/sdk/conference/channel.js b/src/sdk/conference/channel.js
index 4e5b46d3..3e09d893 100644
--- a/src/sdk/conference/channel.js
+++ b/src/sdk/conference/channel.js
@@ -1099,9 +1099,10 @@ export class ConferencePeerConnectionChannel extends EventDispatcher {
     }
     // Only check the first one.
     const param = obj[0];
-    return param.codecPayloadType || param.dtx || param.active ||
-        param.ptime || param.maxFramerate || param.scaleResolutionDownBy ||
-        param.rid;
+    return !!(
+        param.codecPayloadType || param.dtx || param.active || param.ptime ||
+        param.maxFramerate || param.scaleResolutionDownBy || param.rid ||
+        param.scalabilityMode);
   }
 
   _isOwtEncodingParameters(obj) {
diff --git a/test/unit/resources/scripts/conference.js b/test/unit/resources/scripts/conference.js
index 1a4af0b6..b34aa596 100644
--- a/test/unit/resources/scripts/conference.js
+++ b/test/unit/resources/scripts/conference.js
@@ -5,6 +5,7 @@
 'use strict';
 
 import {ConferenceClient} from '../../../../src/sdk/conference/client.js';
+import {ConferencePeerConnectionChannel} from '../../../../src/sdk/conference/channel.js';
 import * as StreamModule from '../../../../src/sdk/base/stream.js';
 import * as EventModule from '../../../../src/sdk/base/event.js'
 
@@ -49,3 +50,52 @@ describe('Unit tests for ConferenceClient', function() {
        });
   });
 });
+
+describe('Unit tests for ConferencePeerConnectionChannel.', () => {
+  describe('Tests for codecs.', () => {
+    it('Correctly detect the type of publishOptions elements.', () => {
+      // For each element in paramters, [object to be tested, is
+      // RTCRtpEncodingParameters, is OwtEncodingParameters].
+      const parameters = [
+        [[{scalabilityMode: 'L3T3'}], true, false],
+        [
+          [
+            {rid: 'q', active: true, scaleResolutionDownBy: 4.0},
+            {rid: 'h', active: true, scaleResolutionDownBy: 2.0},
+            {rid: 'f', active: true}
+          ],
+          true, false
+        ],
+        [true, false, false],
+        [
+          [
+            {
+              codec: {
+                name: 'h264',
+              },
+            },
+            {
+              codec: {
+                name: 'vp9',
+              },
+            },
+            {
+              codec: {
+                name: 'vp8',
+              },
+            }
+          ],
+          false, true
+        ]
+      ];
+      const channel = new ConferencePeerConnectionChannel();
+      for (const [p, isRtpEncodingParameters, isOwtEncodingParameters] of
+               parameters) {
+        expect(channel._isRtpEncodingParameters(p))
+            .to.equal(isRtpEncodingParameters);
+        expect(channel._isOwtEncodingParameters(p))
+            .to.equal(isOwtEncodingParameters);
+      }
+    });
+  });
+});
\ No newline at end of file