diff --git a/acceptor.go b/acceptor.go
index 33375b0..083b47e 100644
--- a/acceptor.go
+++ b/acceptor.go
@@ -253,7 +253,8 @@ func (a *Acceptor) sendWelcome(sessionID int64, response auth.Response) *message
 		"authmethod": a.authMethod,
 	})
 
-	a.sessionDetails = NewSessionDetails(sessionID, a.hello.Realm(), response.AuthID(), response.AuthRole())
+	a.sessionDetails = NewSessionDetails(sessionID, a.hello.Realm(), response.AuthID(), response.AuthRole(),
+		a.serializer.Static())
 	a.state = AcceptorStateWelcomeSent
 
 	return welcome
diff --git a/dealer.go b/dealer.go
index 4b0f340..f305a30 100644
--- a/dealer.go
+++ b/dealer.go
@@ -116,9 +116,7 @@ func (d *Dealer) ReceiveMessage(sessionID int64, msg messages.Message) (*Message
 		}
 
 		var invocation *messages.Invocation
-		if call.PayloadIsBinary() {
-			// FIXME: If CALL has binary payload, we need to make sure the callee
-			//  also supports binary payloads.
+		if call.PayloadIsBinary() && d.sessions[callee].StaticSerializer() {
 			invocation = messages.NewInvocationBinary(invocationID, regs.ID, nil, call.Payload(),
 				call.PayloadSerializer())
 		} else {
@@ -136,7 +134,7 @@ func (d *Dealer) ReceiveMessage(sessionID int64, msg messages.Message) (*Message
 		delete(d.pendingCalls, yield.RequestID())
 
 		var result *messages.Result
-		if yield.PayloadIsBinary() {
+		if yield.PayloadIsBinary() && d.sessions[pending.CallerID].StaticSerializer() {
 			// FIXME: If YIELD has binary payload, we need to make sure the caller
 			//  also supports binary payloads.
 			result = messages.NewResultBinary(pending.RequestID, nil, yield.Payload(), yield.PayloadSerializer())
diff --git a/dealer_test.go b/dealer_test.go
index ada0da5..dd53dca 100644
--- a/dealer_test.go
+++ b/dealer_test.go
@@ -18,7 +18,7 @@ func TestDealerAddRemoveSession(t *testing.T) {
 	})
 
 	t.Run("AddRemove", func(t *testing.T) {
-		details := wampproto.NewSessionDetails(1, "realm", "authid", "anonymous")
+		details := wampproto.NewSessionDetails(1, "realm", "authid", "anonymous", false)
 		err := dealer.AddSession(details)
 		require.NoError(t, err)
 
@@ -34,7 +34,7 @@ func TestDealerRegisterUnRegister(t *testing.T) {
 	dealer := wampproto.NewDealer()
 
 	t.Run("Register", func(t *testing.T) {
-		details := wampproto.NewSessionDetails(1, "realm", "authid", "anonymous")
+		details := wampproto.NewSessionDetails(1, "realm", "authid", "anonymous", false)
 		err := dealer.AddSession(details)
 		require.NoError(t, err)
 
diff --git a/joiner.go b/joiner.go
index dba56c1..a5ebf9e 100644
--- a/joiner.go
+++ b/joiner.go
@@ -112,7 +112,7 @@ func (j *Joiner) ReceiveMessage(msg messages.Message) (messages.Message, error)
 
 		welcome := msg.(*messages.Welcome)
 		j.sessionDetails = NewSessionDetails(welcome.SessionID(), j.realm, welcome.Details()["authid"].(string),
-			welcome.Details()["authrole"].(string))
+			welcome.Details()["authrole"].(string), j.serializer.Static())
 		j.state = joinerStateJoined
 
 		return nil, nil
diff --git a/serializers/cbor.go b/serializers/cbor.go
index 8c79751..7e26cbc 100644
--- a/serializers/cbor.go
+++ b/serializers/cbor.go
@@ -38,3 +38,7 @@ func (c *CBORSerializer) Deserialize(payload []byte) (messages.Message, error) {
 
 	return msg, nil
 }
+
+func (c *CBORSerializer) Static() bool {
+	return false
+}
diff --git a/serializers/json.go b/serializers/json.go
index b5f64c4..d5ccd44 100644
--- a/serializers/json.go
+++ b/serializers/json.go
@@ -29,3 +29,7 @@ func (j *JSONSerializer) Deserialize(payload []byte) (messages.Message, error) {
 
 	return msg, nil
 }
+
+func (j *JSONSerializer) Static() bool {
+	return false
+}
diff --git a/serializers/msgpack.go b/serializers/msgpack.go
index 76d018b..7bf3d9e 100644
--- a/serializers/msgpack.go
+++ b/serializers/msgpack.go
@@ -29,3 +29,7 @@ func (m *MsgPackSerializer) Deserialize(payload []byte) (messages.Message, error
 
 	return msg, nil
 }
+
+func (m *MsgPackSerializer) Static() bool {
+	return false
+}
diff --git a/serializers/serializer.go b/serializers/serializer.go
index 4810b7f..13a69f3 100644
--- a/serializers/serializer.go
+++ b/serializers/serializer.go
@@ -5,4 +5,5 @@ import "github.com/xconnio/wampproto-go/messages"
 type Serializer interface {
 	Serialize(message messages.Message) ([]byte, error)
 	Deserialize([]byte) (messages.Message, error)
+	Static() bool
 }
diff --git a/types.go b/types.go
index 5d05653..52d1621 100644
--- a/types.go
+++ b/types.go
@@ -7,14 +7,17 @@ type SessionDetails struct {
 	realm    string
 	authID   string
 	authRole string
+
+	staticSerializer bool
 }
 
-func NewSessionDetails(id int64, realm, authID, authRole string) *SessionDetails {
+func NewSessionDetails(id int64, realm, authID, authRole string, staticSerializer bool) *SessionDetails {
 	return &SessionDetails{
-		id:       id,
-		realm:    realm,
-		authID:   authID,
-		authRole: authRole,
+		id:               id,
+		realm:            realm,
+		authID:           authID,
+		authRole:         authRole,
+		staticSerializer: staticSerializer,
 	}
 }
 
@@ -34,6 +37,10 @@ func (s *SessionDetails) AuthRole() string {
 	return s.authRole
 }
 
+func (s *SessionDetails) StaticSerializer() bool {
+	return s.staticSerializer
+}
+
 type MessageWithRecipient struct {
 	Message   messages.Message
 	Recipient int64