diff --git a/src/api/ack.ts b/src/api/ack.ts
new file mode 100644
index 000000000..6298a20da
--- /dev/null
+++ b/src/api/ack.ts
@@ -0,0 +1,15 @@
+import { IncomingRequestMessage, IncomingAckRequest } from "../core";
+
+/**
+ * A request to confirm a {@link Session} (incoming ACK).
+ * @public
+ */
+export class Ack {
+  /** @internal */
+  public constructor(private incomingAckRequest: IncomingAckRequest) {}
+
+  /** Incoming ACK request message. */
+  public get request(): IncomingRequestMessage {
+    return this.incomingAckRequest.message;
+  }
+}
diff --git a/src/api/index.ts b/src/api/index.ts
index 88daf1474..7a318eec5 100644
--- a/src/api/index.ts
+++ b/src/api/index.ts
@@ -3,6 +3,7 @@
  * @packageDocumentation
  */
 export * from "./exceptions";
+export * from "./ack";
 export * from "./bye";
 export * from "./emitter";
 export * from "./info";
diff --git a/src/api/session-delegate.ts b/src/api/session-delegate.ts
index cde5ab583..0a3f492ce 100644
--- a/src/api/session-delegate.ts
+++ b/src/api/session-delegate.ts
@@ -1,4 +1,5 @@
 import { IncomingRequestMessage } from "../core";
+import { Ack } from "./ack";
 import { Bye } from "./bye";
 import { Info } from "./info";
 import { Message } from "./message";
@@ -11,6 +12,12 @@ import { SessionDescriptionHandler } from "./session-description-handler";
  * @public
  */
 export interface SessionDelegate {
+  /**
+   * Called upon receiving an incoming in dialog ACK request.
+   * @param ack - The ack.
+   */
+  onAck?(ack: Ack): void;
+
   /**
    * Called upon receiving an incoming in dialog BYE request.
    * @param bye - The bye.
diff --git a/src/api/session.ts b/src/api/session.ts
index 17cc9f254..f9090fcdf 100644
--- a/src/api/session.ts
+++ b/src/api/session.ts
@@ -29,6 +29,7 @@ import {
 } from "../core";
 import { getReasonPhrase } from "../core/messages/utils";
 import { AllowedMethods } from "../core/user-agent-core/allowed-methods";
+import { Ack } from "./ack";
 import { Bye } from "./bye";
 import { Emitter, EmitterImpl } from "./emitter";
 import { ContentTypeUnsupportedError, RequestPendingError } from "./exceptions";
@@ -793,6 +794,11 @@ export abstract class Session {
         : this._sessionDescriptionHandlerModifiers
     };
 
+    if (this.delegate && this.delegate.onAck) {
+      const ack = new Ack(request);
+      this.delegate.onAck(ack);
+    }
+
     // reset pending ACK flag
     this.pendingReinviteAck = false;