diff --git a/messages/CHANGES.md b/messages/CHANGES.md
index 7183d872..45cf1396 100644
--- a/messages/CHANGES.md
+++ b/messages/CHANGES.md
@@ -1,3 +1,6 @@
+# 1.5.0
+- Add an optional "failover" property to `vonage_messages.Messages.send`
+
 # 1.4.0
 - Make all models originally accessed by `vonage_messages.models.***` available at the top level of the package, i.e. `vonage_messages.***`
 
diff --git a/messages/src/vonage_messages/_version.py b/messages/src/vonage_messages/_version.py
index 96e3ce8d..77f1c8e6 100644
--- a/messages/src/vonage_messages/_version.py
+++ b/messages/src/vonage_messages/_version.py
@@ -1 +1 @@
-__version__ = '1.4.0'
+__version__ = '1.5.0'
diff --git a/messages/src/vonage_messages/messages.py b/messages/src/vonage_messages/messages.py
index 3fd62f65..6ba05b98 100644
--- a/messages/src/vonage_messages/messages.py
+++ b/messages/src/vonage_messages/messages.py
@@ -31,21 +31,35 @@ def http_client(self) -> HttpClient:
         return self._http_client
 
     @validate_call
-    def send(self, message: BaseMessage) -> SendMessageResponse:
+    def send(
+        self, message: BaseMessage, failover: list[BaseMessage] = None
+    ) -> SendMessageResponse:
         """Send a message using Vonage's Messages API.
 
         Args:
             message (BaseMessage): The message to be sent as a Pydantic model.
                 Use the provided models (in `vonage_messages.models`) to create messages and pass them in to this method.
+            failover (list[BaseMessage]): A list of failover messages to be attempted if the primary message fails.
 
         Returns:
             SendMessageResponse: Response model containing the unique identifier of the sent message.
                 Access the identifier with the `message_uuid` attribute.
         """
+        body = message.model_dump(by_alias=True, exclude_none=True) or message
+
+        if failover is not None:
+            failover_body = [
+                m.model_dump(by_alias=True, exclude_none=True) or m for m in failover
+            ]
+            body = {
+                **body,
+                'failover': failover_body,
+            }
+
         response = self._http_client.post(
             self._http_client.api_host,
             '/v1/messages',
-            message.model_dump(by_alias=True, exclude_none=True) or message,
+            body,
             self._auth_type,
         )
 
diff --git a/messages/src/vonage_messages/models/rcs.py b/messages/src/vonage_messages/models/rcs.py
index ef856061..b0e98a1a 100644
--- a/messages/src/vonage_messages/models/rcs.py
+++ b/messages/src/vonage_messages/models/rcs.py
@@ -30,7 +30,7 @@ class BaseRcs(BaseMessage):
     """
 
     to: PhoneNumber
-    from_: str = Field(..., serialization_alias='from', pattern='^[a-zA-Z0-9]+$')
+    from_: str = Field(..., serialization_alias='from', pattern='^[a-zA-Z0-9-_]+$')
     ttl: Optional[int] = Field(None, ge=300, le=259200)
     channel: ChannelType = ChannelType.RCS
 
diff --git a/messages/src/vonage_messages/responses.py b/messages/src/vonage_messages/responses.py
index 59a84b50..99e594ed 100644
--- a/messages/src/vonage_messages/responses.py
+++ b/messages/src/vonage_messages/responses.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from pydantic import BaseModel
 
 
@@ -6,6 +8,8 @@ class SendMessageResponse(BaseModel):
 
     Attributes:
         message_uuid (str): The UUID of the sent message.
+        workflow_id [str]: Workflow ID if the `failover` parameter was used in the request.
     """
 
     message_uuid: str
+    workflow_id: Optional[str] = None
diff --git a/messages/tests/data/send_message_with_failover.json b/messages/tests/data/send_message_with_failover.json
new file mode 100644
index 00000000..7a8a12be
--- /dev/null
+++ b/messages/tests/data/send_message_with_failover.json
@@ -0,0 +1,4 @@
+{
+    "message_uuid": "d8f86df1-dec6-442f-870a-2241be27d721",
+    "workflow_id": "3TcNjguHxr2vcCZ9Ddsnq6tw8yQUpZ9rMHv9QXSxLan5ibMxqSzLdx9"
+}
\ No newline at end of file
diff --git a/messages/tests/test_messages.py b/messages/tests/test_messages.py
index 51c8767b..5cde1bc0 100644
--- a/messages/tests/test_messages.py
+++ b/messages/tests/test_messages.py
@@ -1,3 +1,4 @@
+from json import loads
 from os.path import abspath
 
 import responses
@@ -51,6 +52,49 @@ def test_send_message():
     assert messages._auth_type == 'jwt'
 
 
+@responses.activate
+def test_send_message_with_failover():
+    build_response(
+        path,
+        'POST',
+        'https://api.nexmo.com/v1/messages',
+        'send_message_with_failover.json',
+        202,
+    )
+    sms = Sms(
+        from_='Vonage APIs',
+        to='1234567890',
+        text='Hello, World!',
+    )
+    failover = [
+        Sms(from_='Vonage APIs', to='1987654321', text='Failover message'),
+    ]
+
+    response = messages.send(sms, failover=failover)
+    print(messages._http_client.last_request.body)
+    assert loads(messages._http_client.last_request.body) == {
+        "to": "1234567890",
+        "from": "Vonage APIs",
+        "text": "Hello, World!",
+        "channel": "sms",
+        "message_type": "text",
+        "failover": [
+            {
+                "to": "1987654321",
+                "from": "Vonage APIs",
+                "text": "Failover message",
+                "channel": "sms",
+                "message_type": "text",
+            }
+        ],
+    }
+    assert response.message_uuid == 'd8f86df1-dec6-442f-870a-2241be27d721'
+    assert (
+        response.workflow_id == '3TcNjguHxr2vcCZ9Ddsnq6tw8yQUpZ9rMHv9QXSxLan5ibMxqSzLdx9'
+    )
+    assert messages._auth_type == 'jwt'
+
+
 @responses.activate
 def test_send_message_basic_auth():
     build_response(
diff --git a/vonage/CHANGES.md b/vonage/CHANGES.md
index 185e6aa3..f75f9a3b 100644
--- a/vonage/CHANGES.md
+++ b/vonage/CHANGES.md
@@ -1,3 +1,6 @@
+# 4.5.0
+- vonage-messages: add an optional "failover" property to `vonage_messages.Messages.send`
+
 # 4.4.3
 - vonage-number-insight: use basic header auth instead of request body auth
 
diff --git a/vonage/pyproject.toml b/vonage/pyproject.toml
index c04e105f..3ac25bb2 100644
--- a/vonage/pyproject.toml
+++ b/vonage/pyproject.toml
@@ -5,11 +5,10 @@ description = "Python Server SDK for using Vonage APIs"
 readme = "README.md"
 requires-python = ">=3.9"
 dependencies = [
-  "vonage-utils>=1.1.4",
-  "vonage-http-client>=1.5.1",
   "vonage-account>=1.1.1",
   "vonage-application>=2.0.1",
-  "vonage-messages>=1.4.0",
+  "vonage-http-client>=1.5.1",
+  "vonage-messages>=1.5.0",
   "vonage-network-auth>=1.0.2",
   "vonage-network-sim-swap>=1.1.2",
   "vonage-network-number-verification>=1.0.2",
@@ -18,6 +17,7 @@ dependencies = [
   "vonage-sms>=1.1.6",
   "vonage-subaccounts>=1.0.4",
   "vonage-users>=1.2.1",
+  "vonage-utils>=1.1.4",
   "vonage-verify>=2.1.0",
   "vonage-verify-legacy>=1.0.1",
   "vonage-video>=1.2.0",
diff --git a/vonage/src/vonage/_version.py b/vonage/src/vonage/_version.py
index 77ed0d0b..330025d8 100644
--- a/vonage/src/vonage/_version.py
+++ b/vonage/src/vonage/_version.py
@@ -1 +1 @@
-__version__ = '4.4.3'
+__version__ = '4.5.0'