diff --git a/app/celery/broadcast_message_tasks.py b/app/celery/broadcast_message_tasks.py
index 9def33129..213b671ef 100644
--- a/app/celery/broadcast_message_tasks.py
+++ b/app/celery/broadcast_message_tasks.py
@@ -2,10 +2,11 @@ import uuid
 
 from flask import current_app
 from notifications_utils.statsd_decorators import statsd
+from sqlalchemy.schema import Sequence
 
-from app import cbc_proxy_client, notify_celery
+from app import cbc_proxy_client, db, notify_celery
 from app.config import QueueNames
-from app.models import BroadcastEventMessageType
+from app.models import BroadcastEventMessageType, BroadcastProvider
 from app.dao.broadcast_message_dao import dao_get_broadcast_event_by_id, create_broadcast_provider_message
 
 
@@ -78,6 +79,10 @@ def send_broadcast_provider_message(broadcast_event_id, provider):
 @notify_celery.task(name='trigger-link-test')
 def trigger_link_test(provider):
     identifier = str(uuid.uuid4())
+    sequential_number = None
+    if provider == BroadcastProvider.VODAFONE:
+        sequence = Sequence('broadcast_provider_message_number_seq')
+        sequential_number = db.session.connection().execute(sequence)
     message = f"Sending a link test to CBC proxy for provider {provider} with ID {identifier}"
     current_app.logger.info(message)
-    cbc_proxy_client.get_proxy(provider).send_link_test(identifier)
+    cbc_proxy_client.get_proxy(provider).send_link_test(identifier, sequential_number)
diff --git a/app/clients/cbc_proxy.py b/app/clients/cbc_proxy.py
index 81d1a34d0..6a730301d 100644
--- a/app/clients/cbc_proxy.py
+++ b/app/clients/cbc_proxy.py
@@ -42,6 +42,7 @@ class CBCProxyClient:
         proxy_classes = {
             'canary': CBCProxyCanary,
             BroadcastProvider.EE: CBCProxyEE,
+            BroadcastProvider.VODAFONE: CBCProxyVodafone,
         }
         return proxy_classes[provider](self._lambda_client)
 
@@ -61,6 +62,7 @@ class CBCProxyClientBase:
     def send_link_test(
         self,
         identifier,
+        sequential_number=None
     ):
         pass
 
@@ -131,6 +133,7 @@ class CBCProxyEE(CBCProxyClientBase):
     def send_link_test(
         self,
         identifier,
+        sequential_number=None
     ):
         """
         link test - open up a connection to a specific provider, and send them an xml payload with a <msgType> of
@@ -155,3 +158,20 @@ class CBCProxyEE(CBCProxyClientBase):
             'expires': expires,
         }
         self._invoke_lambda(payload=payload)
+
+
+class CBCProxyVodafone(CBCProxyClientBase):
+    lambda_name = 'bt-ee-1-proxy'
+
+    def send_link_test(
+        self,
+        identifier,
+        sequential_number
+    ):
+        """
+        link test - open up a connection to a specific provider, and send them an xml payload with a <msgType> of
+        test.
+        """
+        payload = {'message_type': 'test', 'identifier': identifier, 'message_number': sequential_number}
+
+        self._invoke_lambda(payload=payload)
diff --git a/tests/app/celery/test_broadcast_message_tasks.py b/tests/app/celery/test_broadcast_message_tasks.py
index c6afb6998..1b0ccecd8 100644
--- a/tests/app/celery/test_broadcast_message_tasks.py
+++ b/tests/app/celery/test_broadcast_message_tasks.py
@@ -279,14 +279,18 @@ def test_send_broadcast_provider_message_errors(mocker, sample_service):
     )
 
 
+@pytest.mark.parametrize("provider,provider_capitalised", [
+    ["ee", "EE"],
+    ["vodafone", "Vodafone"]
+])
 def test_trigger_link_tests_invokes_cbc_proxy_client(
-    mocker,
+    mocker, provider, provider_capitalised
 ):
     mock_send_link_test = mocker.patch(
-        'app.clients.cbc_proxy.CBCProxyEE.send_link_test',
+        f'app.clients.cbc_proxy.CBCProxy{provider_capitalised}.send_link_test',
     )
 
-    trigger_link_test('ee')
+    trigger_link_test(provider)
 
     assert mock_send_link_test.called
     # the 0th argument of the call to send_link_test
@@ -296,3 +300,9 @@ def test_trigger_link_tests_invokes_cbc_proxy_client(
         uuid.UUID(identifier)
     except BaseException:
         pytest.fail(f"{identifier} is not a valid uuid")
+
+    # testing sequential number:
+    if provider == 'vodafone':
+        assert type(mock_send_link_test.mock_calls[0][1][1]) is int
+    else:
+        assert not mock_send_link_test.mock_calls[0][1][1]
diff --git a/tests/app/db.py b/tests/app/db.py
index 30f00e7b6..a0354e894 100644
--- a/tests/app/db.py
+++ b/tests/app/db.py
@@ -63,7 +63,8 @@ from app.models import (
     BroadcastMessage,
     BroadcastStatusType,
     BroadcastEvent,
-    BroadcastProviderMessage
+    BroadcastProviderMessage,
+    BroadcastProviderMessageNumber
 )
 
 
@@ -1058,11 +1059,19 @@ def create_broadcast_provider_message(
     provider,
     status='sending'
 ):
+    broadcast_provider_message_id = uuid.uuid4()
     provider_message = BroadcastProviderMessage(
+        id=broadcast_provider_message_id,
         broadcast_event=broadcast_event,
         provider=provider,
-        status=status
+        status=status,
     )
     db.session.add(provider_message)
+    db.session.commit()
+
+    provider_message_number = BroadcastProviderMessageNumber(
+        broadcast_provider_message_id=broadcast_provider_message_id)
+    db.session.add(provider_message_number)
+
     db.session.commit()
     return provider_message