diff --git a/src/server.py b/src/server.py
index 1f327a60..d985b21d 100644
--- a/src/server.py
+++ b/src/server.py
@@ -7,8 +7,11 @@
 
 import logging
 
-from pynetdicom import AE, StoragePresentationContexts, evt
+import pydicom.uid as dicom_uid
+from pynetdicom import AE, evt
 from pynetdicom.sop_class import (
+    DigitalMammographyXRayImageStorageForPresentation,  # type: ignore[attr-defined]
+    DigitalMammographyXRayImageStorageForProcessing,  # type: ignore[attr-defined]
     ModalityPerformedProcedureStep,  # type: ignore[attr-defined]
     ModalityWorklistInformationFind,  # type: ignore[attr-defined]
 )
@@ -56,8 +59,17 @@ def start(self):
         """Start the PACS server and listen for incoming connections."""
         logger.info(f"Starting PACS server: {self.ae_title} on port {self.port}")
 
+        transfer_syntaxes = [
+            dicom_uid.JPEGLosslessSV1,  # Hologic preferred
+            dicom_uid.ExplicitVRLittleEndian,
+            dicom_uid.ImplicitVRLittleEndian,
+            dicom_uid.ExplicitVRBigEndian,
+            dicom_uid.JPEGLSLossless,
+            dicom_uid.JPEG2000Lossless,
+        ]
         self.ae = AE(ae_title=self.ae_title)
-        self.ae.supported_contexts = StoragePresentationContexts
+        self.ae.add_supported_context(DigitalMammographyXRayImageStorageForPresentation, transfer_syntaxes)
+        self.ae.add_supported_context(DigitalMammographyXRayImageStorageForProcessing, transfer_syntaxes)
 
         handlers = [
             (evt.EVT_C_ECHO, CEcho().call),
diff --git a/src/services/dicom/c_store.py b/src/services/dicom/c_store.py
index acfe45ad..55205634 100644
--- a/src/services/dicom/c_store.py
+++ b/src/services/dicom/c_store.py
@@ -3,10 +3,6 @@
 
 from pydicom import Dataset, dcmwrite
 from pynetdicom.events import Event
-from pynetdicom.sop_class import (
-    DigitalMammographyXRayImageStorageForPresentation,  # type: ignore
-    DigitalMammographyXRayImageStorageForProcessing,  # type: ignore
-)
 
 from services.dicom import FAILURE, SUCCESS
 from services.dicom.image_compressor import ImageCompressor
@@ -18,11 +14,6 @@
 
 
 class CStore:
-    VALID_SOP_CLASSES = [
-        DigitalMammographyXRayImageStorageForPresentation,
-        DigitalMammographyXRayImageStorageForProcessing,
-    ]
-
     def __init__(
         self,
         storage: PACSStorage,
@@ -42,10 +33,6 @@ def call(self, event: Event) -> int:
             ds = event.dataset
             ds.file_meta = event.file_meta
 
-            if ds.file_meta.MediaStorageSOPClassUID not in self.VALID_SOP_CLASSES:
-                logger.error(f"Invalid SOP Class UID: {ds.file_meta.MediaStorageSOPClassUID}")
-                return FAILURE
-
             sop_instance_uid = ds.get("SOPInstanceUID", "")
             accession_number = ds.get("AccessionNumber", "")
             patient_id = ds.get("PatientID")
diff --git a/tests/test_server.py b/tests/test_server.py
index 23a76197..da9844e8 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -3,6 +3,8 @@
 
 from pynetdicom import evt
 from pynetdicom.sop_class import (  # pyright: ignore[reportAttributeAccessIssue]
+    DigitalMammographyXRayImageStorageForPresentation,
+    DigitalMammographyXRayImageStorageForProcessing,
     ModalityPerformedProcedureStep,
     ModalityWorklistInformationFind,
 )
@@ -51,6 +53,9 @@ def test_start(self, mock_c_store, mock_c_echo, mock_ae, _mock_pacs_storage, _mo
         assert subject.ae == mock_ae.return_value
 
         mock_ae.assert_called_once_with(ae_title="SCREENING_PACS")
+        add_context_calls = [call.args[0] for call in mock_ae.return_value.add_supported_context.call_args_list]
+        assert DigitalMammographyXRayImageStorageForPresentation in add_context_calls
+        assert DigitalMammographyXRayImageStorageForProcessing in add_context_calls
         mock_ae.return_value.start_server.assert_called_once_with(
             ("0.0.0.0", 4244),
             block=True,