diff --git a/CpEpEngine.cpp b/CpEpEngine.cpp
index 435479d..60b4f82 100644
--- a/CpEpEngine.cpp
+++ b/CpEpEngine.cpp
@@ -1770,3 +1770,26 @@ STDMETHODIMP CpEpEngine::DeliverHandshakeResult(enum SyncHandshakeResult result,
 
 	return S_OK;
 }
+
+STDMETHODIMP CpEpEngine::PERToXERSyncMessage(TextMessage *msg, BSTR * xer)
+{
+	assert(msg);
+
+	if (!msg)
+		return E_INVALIDARG;
+
+	char* text;
+	::message *_msg = text_message_to_C(msg);
+	char* val = _msg->attachments->value;
+
+	PEP_STATUS status = ::PER_to_XER_Sync_msg(val, strlen(val), &text);
+	free_message(_msg);
+
+	if (status != PEP_STATUS_OK)
+		return FAIL(L"cannot get XER", status);
+
+	*xer = utf16_bstr(text);
+	pEp_free(text);
+
+	return S_OK;
+}
diff --git a/CpEpEngine.h b/CpEpEngine.h
index bfcdef5..20e4314 100644
--- a/CpEpEngine.h
+++ b/CpEpEngine.h
@@ -12,6 +12,7 @@
 #include <mutex>
 #include <vector>
 #include "..\libpEpAdapter\pc_container.hh"
+#include "..\pEp\sync_codec.h"
 
 #if defined(_WIN32_WCE) && !defined(_CE_DCOM) && !defined(_CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA)
 #error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM object's and allow use of it's single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
@@ -277,6 +278,8 @@ public:
 	// sync API
 	STDMETHOD(DeliverHandshakeResult)(enum SyncHandshakeResult result, SAFEARRAY *identities_sharing);
 	STDMETHOD(LeaveDeviceGroup)();
+
+	STDMETHOD(PERToXERSyncMessage)(TextMessage *msg, BSTR * xer);
 };
 
 OBJECT_ENTRY_AUTO(__uuidof(pEpEngine), CpEpEngine)
diff --git a/pEpCOMServerAdapter.idl b/pEpCOMServerAdapter.idl
index 954c553..9f87b3c 100644
--- a/pEpCOMServerAdapter.idl
+++ b/pEpCOMServerAdapter.idl
@@ -493,6 +493,9 @@ interface IpEpEngine : IUnknown {
 
 	// Get the comm type a bare key has
 	[id(53)] HRESULT GetKeyRating([in] BSTR fpr, [out, retval] pEpComType *commType);
+
+	// Decode a Sync message from PER into XER
+	[id(54)] HRESULT PERToXERSyncMessage([in] struct TextMessage *msg, [out, retval] BSTR *xer);
 };
 
 [