diff --git a/packages/core/src/envelope.ts b/packages/core/src/envelope.ts
index 1c148015ae63..1a2f44fd82c6 100644
--- a/packages/core/src/envelope.ts
+++ b/packages/core/src/envelope.ts
@@ -2,7 +2,6 @@ import {
   DsnComponents,
   Event,
   EventEnvelope,
-  EventEnvelopeHeaders,
   EventItem,
   SdkInfo,
   SdkMetadata,
@@ -11,7 +10,12 @@ import {
   SessionEnvelope,
   SessionItem,
 } from '@sentry/types';
-import { createEnvelope, dropUndefinedKeys, dsnToString, getSdkMetadataForEnvelopeHeader } from '@sentry/utils';
+import {
+  createEnvelope,
+  createEventEnvelopeHeaders,
+  dsnToString,
+  getSdkMetadataForEnvelopeHeader,
+} from '@sentry/utils';
 
 /**
  * Apply SdkInfo (name, version, packages, integrations) to the corresponding event key.
@@ -74,23 +78,3 @@ export function createEventEnvelope(
   const eventItem: EventItem = [{ type: eventType }, event];
   return createEnvelope<EventEnvelope>(envelopeHeaders, [eventItem]);
 }
-
-function createEventEnvelopeHeaders(
-  event: Event,
-  sdkInfo: SdkInfo | undefined,
-  tunnel: string | undefined,
-  dsn: DsnComponents,
-): EventEnvelopeHeaders {
-  const dynamicSamplingContext = event.sdkProcessingMetadata && event.sdkProcessingMetadata.dynamicSamplingContext;
-
-  return {
-    event_id: event.event_id as string,
-    sent_at: new Date().toISOString(),
-    ...(sdkInfo && { sdk: sdkInfo }),
-    ...(!!tunnel && { dsn: dsnToString(dsn) }),
-    ...(event.type === 'transaction' &&
-      dynamicSamplingContext && {
-        trace: dropUndefinedKeys({ ...dynamicSamplingContext }),
-      }),
-  };
-}
diff --git a/packages/replay/src/replay.ts b/packages/replay/src/replay.ts
index 5a2e7f285f57..f83ed70b109b 100644
--- a/packages/replay/src/replay.ts
+++ b/packages/replay/src/replay.ts
@@ -921,8 +921,9 @@ export class ReplayContainer implements ReplayContainerInterface {
     const client = hub.getClient();
     const scope = hub.getScope();
     const transport = client && client.getTransport();
+    const dsn = client?.getDsn();
 
-    if (!client || !scope || !transport) {
+    if (!client || !scope || !transport || !dsn) {
       return;
     }
 
@@ -982,7 +983,7 @@ export class ReplayContainer implements ReplayContainerInterface {
     }
     */
 
-    const envelope = createReplayEnvelope(replayId, replayEvent, payloadWithSequence);
+    const envelope = createReplayEnvelope(replayEvent, payloadWithSequence, dsn, client.getOptions().tunnel);
 
     try {
       return transport.send(envelope);
diff --git a/packages/replay/src/util/createReplayEnvelope.ts b/packages/replay/src/util/createReplayEnvelope.ts
index c42ff1fa8d5d..8850974ec18b 100644
--- a/packages/replay/src/util/createReplayEnvelope.ts
+++ b/packages/replay/src/util/createReplayEnvelope.ts
@@ -1,17 +1,14 @@
-import { Envelope, Event } from '@sentry/types';
-import { createEnvelope, getSdkMetadataForEnvelopeHeader } from '@sentry/utils';
+import { DsnComponents, Envelope, Event } from '@sentry/types';
+import { createEnvelope, createEventEnvelopeHeaders, getSdkMetadataForEnvelopeHeader } from '@sentry/utils';
 
 export function createReplayEnvelope(
-  replayId: string,
   replayEvent: Event,
   payloadWithSequence: string | Uint8Array,
+  dsn: DsnComponents,
+  tunnel?: string,
 ): Envelope {
   return createEnvelope(
-    {
-      event_id: replayId,
-      sent_at: new Date().toISOString(),
-      sdk: getSdkMetadataForEnvelopeHeader(replayEvent),
-    },
+    createEventEnvelopeHeaders(replayEvent, getSdkMetadataForEnvelopeHeader(replayEvent), tunnel, dsn),
     [
       // @ts-ignore New types
       [{ type: 'replay_event' }, replayEvent],
diff --git a/packages/replay/test/unit/util/createReplayEnvelope.test.ts b/packages/replay/test/unit/util/createReplayEnvelope.test.ts
index a3564f0c34da..76fd3348cecb 100644
--- a/packages/replay/test/unit/util/createReplayEnvelope.test.ts
+++ b/packages/replay/test/unit/util/createReplayEnvelope.test.ts
@@ -1,41 +1,86 @@
 import { Event } from '@sentry/types';
+import { makeDsn } from '@sentry/utils';
 
 import { createReplayEnvelope } from '../../../src/util/createReplayEnvelope';
 
 describe('createReplayEnvelope', () => {
+  const REPLAY_ID = 'MY_REPLAY_ID';
+
+  const replayEvent = {
+    type: 'replay_event',
+    timestamp: 1670837008.634,
+    error_ids: ['errorId'],
+    trace_ids: ['traceId'],
+    urls: ['https://example.com'],
+    replay_id: REPLAY_ID,
+    segment_id: 3,
+    platform: 'javascript',
+    event_id: REPLAY_ID,
+    environment: 'production',
+    sdk: {
+      integrations: ['BrowserTracing', 'Replay'],
+      name: 'sentry.javascript.browser',
+      version: '7.25.0',
+    },
+    tags: {
+      sessionSampleRate: 1,
+      errorSampleRate: 0,
+      replayType: 'error',
+    },
+  };
+
+  const payloadWithSequence = 'payload';
+
+  const dsn = makeDsn({
+    host: 'sentry.io',
+    pass: 'xyz',
+    port: '1234',
+    projectId: '123',
+    protocol: 'https',
+    publicKey: 'abc',
+  });
+
   it('creates an envelope for a given Replay event', () => {
-    const replayId = '1234';
-    const replayEvent = {
-      type: 'replay_event',
-      timestamp: 1670837008.634,
-      error_ids: ['errorId'],
-      trace_ids: ['traceId'],
-      urls: ['https://example.com'],
-      replay_id: 'eventId',
-      segment_id: 3,
-      platform: 'javascript',
-      event_id: 'eventId',
-      environment: 'production',
-      sdk: {
-        integrations: ['BrowserTracing', 'Replay'],
-        name: 'sentry.javascript.browser',
-        version: '7.25.0',
-      },
-      tags: {
-        sessionSampleRate: 1,
-        errorSampleRate: 0,
-        replayType: 'error',
+    const envelope = createReplayEnvelope(replayEvent as Event, payloadWithSequence, dsn);
+
+    expect(envelope).toEqual([
+      {
+        event_id: REPLAY_ID,
+        sdk: { name: 'sentry.javascript.browser', version: '7.25.0' },
+        sent_at: expect.any(String),
       },
-    };
-    const payloadWithSequence = 'payload';
+      [
+        [
+          { type: 'replay_event' },
+          {
+            environment: 'production',
+            error_ids: ['errorId'],
+            event_id: REPLAY_ID,
+            platform: 'javascript',
+            replay_id: REPLAY_ID,
+            sdk: { integrations: ['BrowserTracing', 'Replay'], name: 'sentry.javascript.browser', version: '7.25.0' },
+            segment_id: 3,
+            tags: { errorSampleRate: 0, replayType: 'error', sessionSampleRate: 1 },
+            timestamp: 1670837008.634,
+            trace_ids: ['traceId'],
+            type: 'replay_event',
+            urls: ['https://example.com'],
+          },
+        ],
+        [{ length: 7, type: 'replay_recording' }, 'payload'],
+      ],
+    ]);
+  });
 
-    const envelope = createReplayEnvelope(replayId, replayEvent as Event, payloadWithSequence);
+  it('creates an envelope with the `dsn` key in the header if `tunnel` is specified', () => {
+    const envelope = createReplayEnvelope(replayEvent as Event, payloadWithSequence, dsn, '/my-tunnel-endpoint');
 
     expect(envelope).toEqual([
       {
-        event_id: '1234',
+        event_id: REPLAY_ID,
         sdk: { name: 'sentry.javascript.browser', version: '7.25.0' },
         sent_at: expect.any(String),
+        dsn: 'https://abc@sentry.io:1234/123',
       },
       [
         [
@@ -43,9 +88,9 @@ describe('createReplayEnvelope', () => {
           {
             environment: 'production',
             error_ids: ['errorId'],
-            event_id: 'eventId',
+            event_id: REPLAY_ID,
             platform: 'javascript',
-            replay_id: 'eventId',
+            replay_id: REPLAY_ID,
             sdk: { integrations: ['BrowserTracing', 'Replay'], name: 'sentry.javascript.browser', version: '7.25.0' },
             segment_id: 3,
             tags: { errorSampleRate: 0, replayType: 'error', sessionSampleRate: 1 },
diff --git a/packages/utils/src/envelope.ts b/packages/utils/src/envelope.ts
index 3d6dbd6706cd..92037d18ddfe 100644
--- a/packages/utils/src/envelope.ts
+++ b/packages/utils/src/envelope.ts
@@ -2,15 +2,18 @@ import {
   Attachment,
   AttachmentItem,
   DataCategory,
+  DsnComponents,
   Envelope,
   EnvelopeItem,
   EnvelopeItemType,
   Event,
+  EventEnvelopeHeaders,
   SdkInfo,
   SdkMetadata,
   TextEncoderInternal,
 } from '@sentry/types';
 
+import { dsnToString } from './dsn';
 import { normalize } from './normalize';
 import { dropUndefinedKeys } from './object';
 
@@ -154,3 +157,27 @@ export function getSdkMetadataForEnvelopeHeader(metadataOrEvent?: SdkMetadata |
   const { name, version } = metadataOrEvent.sdk;
   return { name, version };
 }
+
+/**
+ * Creates event envelope headers, based on event, sdk info and tunnel
+ * Note: This function was extracted from the core package to make it available in Replay
+ */
+export function createEventEnvelopeHeaders(
+  event: Event,
+  sdkInfo: SdkInfo | undefined,
+  tunnel: string | undefined,
+  dsn: DsnComponents,
+): EventEnvelopeHeaders {
+  const dynamicSamplingContext = event.sdkProcessingMetadata && event.sdkProcessingMetadata.dynamicSamplingContext;
+
+  return {
+    event_id: event.event_id as string,
+    sent_at: new Date().toISOString(),
+    ...(sdkInfo && { sdk: sdkInfo }),
+    ...(!!tunnel && { dsn: dsnToString(dsn) }),
+    ...(event.type === 'transaction' &&
+      dynamicSamplingContext && {
+        trace: dropUndefinedKeys({ ...dynamicSamplingContext }),
+      }),
+  };
+}