diff --git a/packages/acn/src/models.ts b/packages/acn/src/models.ts
index 56e80e8..5b1e4bf 100644
--- a/packages/acn/src/models.ts
+++ b/packages/acn/src/models.ts
@@ -80,8 +80,16 @@ export type SDTJoinAcceptData = {
   reciprocalChannel: number;
 };
 
+export type SDTJoinRefuseData = {
+  leaderComponentID: string;
+  channelNumber: number;
+  memberID: number;
+  reliableSequenceNumber: number;
+  refuseCode: number;
+};
+
 export type SessionDataTransportPDU = {
   vector: SessionDataTransportVectors;
   // TODO(jwetzell): cleanup these types
-  data: SDTJoinData | SDTJoinAcceptData | Uint8Array;
+  data: SDTJoinData | SDTJoinAcceptData | SDTJoinRefuseData| Uint8Array;
 };
diff --git a/packages/acn/src/pdu/sdt.ts b/packages/acn/src/pdu/sdt.ts
index d231de2..27108a8 100644
--- a/packages/acn/src/pdu/sdt.ts
+++ b/packages/acn/src/pdu/sdt.ts
@@ -93,6 +93,20 @@ export function decode(bytes: Uint8Array): SessionDataTransportPDU {
         data: joinData,
       };
     }
+    case SessionDataTransportVectors.JOIN_REFUSE: {
+      const joinData = {
+        leaderComponentID: toHex(bytes.subarray(dataOffset, dataOffset + 16)),
+        channelNumber: view.getUint16(dataOffset + 16),
+        memberID: view.getUint16(dataOffset + 18),
+        reliableSequenceNumber: view.getUint32(dataOffset + 20),
+        refuseCode: view.getUint8(dataOffset + 24),
+      };
+
+      return {
+        vector,
+        data: joinData,
+      };
+    }
     default:
       console.error(`unhandled SDT vector: ${vector}`);
       break;