diff --git a/src/main/java/it/pagopa/pn/workflowmanager/exceptions/WorkflowManagerExceptionCodes.java b/src/main/java/it/pagopa/pn/workflowmanager/exceptions/WorkflowManagerExceptionCodes.java
index 980658e..a0eb6cd 100644
--- a/src/main/java/it/pagopa/pn/workflowmanager/exceptions/WorkflowManagerExceptionCodes.java
+++ b/src/main/java/it/pagopa/pn/workflowmanager/exceptions/WorkflowManagerExceptionCodes.java
@@ -24,5 +24,6 @@ public class WorkflowManagerExceptionCodes extends PnExceptionsCodes {
     public static final String ERROR_CODE_WORKFLOWMANAGER_UNKNOWN_EVENT_CODE = "PN_WORKFLOWMANAGER_UNKNOWNEVENTCODE";
     public static final String ERROR_CODE_WORKFLOWMANAGER_CHANNEL_TRIGGER_EVENT_NOT_FOUND = "PN_WORKFLOWMANAGER_CHANNELTRIGGEREVENTNOTFOUND";
     public static final String ERROR_CODE_WORKFLOWMANAGER_PAYMENT_NOT_FOUND = "PN_WORKFLOWMANAGER_PAYMENTNOTFOUND";
+    public static final String ERROR_CODE_WORKFLOWMANAGER_SENDSMSNOTIFICATIONFAILED = "PN_WORKFLOWMANAGER_SENDSMSNOTIFICATIONFAILED";
     public static final String ERROR_CODE_WORKFLOWMANAGER_SENDEMAILNOTIFICATIONFAILED = "PN_WORKFLOWMANAGER_SENDEMAILNOTIFICATIONFAILED";
 }
diff --git a/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClient.java b/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClient.java
index d2adca0..6d22baa 100644
--- a/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClient.java
+++ b/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClient.java
@@ -31,4 +31,10 @@ void sendNotificationEMAIL(
             DigitalAddressInt digitalAddress,
             List<String> attachmentUrls
     );
+
+    void sendNotificationSMS(
+            String requestIdx,
+            String textMessage,
+            String senderDigitalAddress
+    );
 }
diff --git a/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImpl.java b/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImpl.java
index 437e7e0..7d35ab4 100644
--- a/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImpl.java
+++ b/src/main/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImpl.java
@@ -11,6 +11,7 @@
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.api.DigitalCourtesyMessagesApi;
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.api.DigitalLegalMessagesApi;
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.model.DigitalCourtesyMailRequest;
+import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.model.DigitalCourtesySmsRequest;
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.model.DigitalNotificationRequest;
 import lombok.CustomLog;
 import lombok.RequiredArgsConstructor;
@@ -22,6 +23,7 @@
 
 import static it.pagopa.pn.workflowmanager.exceptions.WorkflowManagerExceptionCodes.ERROR_CODE_WORKFLOWMANAGER_SENDEMAILNOTIFICATIONFAILED;
 import static it.pagopa.pn.workflowmanager.exceptions.WorkflowManagerExceptionCodes.ERROR_CODE_WORKFLOWMANAGER_SENDPECNOTIFICATIONFAILED;
+import static it.pagopa.pn.workflowmanager.exceptions.WorkflowManagerExceptionCodes.ERROR_CODE_WORKFLOWMANAGER_SENDSMSNOTIFICATIONFAILED;
 
 @Component
 @CustomLog
@@ -105,4 +107,32 @@ public void sendNotificationEMAIL(String requestId,
         digitalNotificationRequest.setAttachmentUrls(attachmentUrls.stream().map(FileUtils::getKeyWithStoragePrefix).toList());
         return digitalNotificationRequest;
     }
+
+    @Override
+    public void sendNotificationSMS(
+            String requestIdx,
+            String textMessage,
+            String senderDigitalAddress
+    ) {
+        try {
+            log.logInvokingAsyncExternalService(CLIENT_NAME, COURTESY_NOTIFICATION_REQUEST + "[SMS]", requestIdx);
+            log.debug("[enter] sendNotificationSMS requestId={} senderDigitalAddress={}", requestIdx, LogUtils.maskNumber(senderDigitalAddress));
+
+            DigitalCourtesySmsRequest digitalNotificationRequest = new DigitalCourtesySmsRequest();
+            digitalNotificationRequest.setChannel(DigitalCourtesySmsRequest.ChannelEnum.SMS);
+            digitalNotificationRequest.setRequestId(requestIdx);
+            digitalNotificationRequest.setCorrelationId(requestIdx);
+            digitalNotificationRequest.setEventType(EVENT_TYPE_INFORMAL);
+            digitalNotificationRequest.setQos(DigitalCourtesySmsRequest.QosEnum.BATCH);
+            digitalNotificationRequest.setReceiverDigitalAddress(senderDigitalAddress);
+            digitalNotificationRequest.setClientRequestTimeStamp(Instant.now());
+            digitalNotificationRequest.setMessageText(textMessage);
+
+            digitalCourtesyMessagesApi.sendCourtesyShortMessage(requestIdx, cfg.getCxId(), digitalNotificationRequest);
+            log.debug("[exit] sendNotificationSMS requestId={} senderDigitalAddress={}", requestIdx, LogUtils.maskNumber(senderDigitalAddress));
+        } catch (Exception e) {
+            log.error("error sending SMS notification for requestIdx={}", requestIdx);
+            throw new PnInternalException("error sending SMS notification", ERROR_CODE_WORKFLOWMANAGER_SENDSMSNOTIFICATIONFAILED, e);
+        }
+    }
 }
diff --git a/src/test/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImplTest.java b/src/test/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImplTest.java
index ea9f145..b75e304 100644
--- a/src/test/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImplTest.java
+++ b/src/test/java/it/pagopa/pn/workflowmanager/middleware/externalclient/pnclient/externalchannel/PnExternalChannelsClientImplTest.java
@@ -11,6 +11,7 @@
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.api.DigitalCourtesyMessagesApi;
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.api.DigitalLegalMessagesApi;
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.model.DigitalCourtesyMailRequest;
+import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.model.DigitalCourtesySmsRequest;
 import it.pagopa.pn.workflowmanager.generated.openapi.msclient.externalchannels.model.DigitalNotificationRequest;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -256,4 +257,46 @@ void wrapsWhenSendNotificationEmailFailAndRethrowsWhenExternalApiFails() {
 
         assertSame(apiException, thrown.getCause());
     }
+
+    @Test
+    void sendsSmsNotificationWithExpectedPayload() {
+        String requestIdx = "request-idx";
+        String cxId = "cx-id";
+        String textMessage = "Hello SMS";
+        String senderDigitalAddress = "+39123456789";
+
+        when(cfg.getCxId()).thenReturn(cxId);
+
+        client.sendNotificationSMS(requestIdx, textMessage, senderDigitalAddress);
+
+        ArgumentCaptor<DigitalCourtesySmsRequest> requestCaptor = ArgumentCaptor.forClass(DigitalCourtesySmsRequest.class);
+        verify(digitalCourtesyMessagesApi).sendCourtesyShortMessage(eq(requestIdx), eq(cxId), requestCaptor.capture());
+
+        DigitalCourtesySmsRequest sent = requestCaptor.getValue();
+        assertEquals(DigitalCourtesySmsRequest.ChannelEnum.SMS, sent.getChannel());
+        assertEquals(requestIdx, sent.getRequestId());
+        assertEquals(requestIdx, sent.getCorrelationId());
+        assertEquals("INFORMAL", sent.getEventType());
+        assertEquals(DigitalCourtesySmsRequest.QosEnum.BATCH, sent.getQos());
+        assertEquals(senderDigitalAddress, sent.getReceiverDigitalAddress());
+        assertEquals(textMessage, sent.getMessageText());
+        assertNotNull(sent.getClientRequestTimeStamp());
+    }
+
+    @Test
+    void wrapsAndRethrowsWhenSmsApiFails() {
+        String requestIdx = "request-idx";
+        RuntimeException apiException = new RuntimeException("boom");
+
+        when(cfg.getCxId()).thenReturn("cx-id");
+        doThrow(apiException).when(digitalCourtesyMessagesApi)
+                .sendCourtesyShortMessage(anyString(), anyString(), any(DigitalCourtesySmsRequest.class));
+
+        PnInternalException thrown = assertThrows(
+                PnInternalException.class,
+                () -> client.sendNotificationSMS(requestIdx, "text", "+39123456789")
+        );
+
+        assertSame(apiException, thrown.getCause());
+    }
 }
\ No newline at end of file