diff --git a/.codecov.yml b/.codecov.yml
index f59167a..241b309 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -62,6 +62,10 @@ component_management:
       name: server
       paths:
         - server/**
+    - component_id: module_talk
+      name: talk
+      paths:
+        - talk/**
     - component_id: module_test
       name: test
       paths:
diff --git a/Makefile b/Makefile
index d511c32..a203c28 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ PROTO_FILES := $(filter-out $(GRPC_PROTO_FILES),$(basename $(wildcard *.proto)))
 PROTO_GO_FILES := $(addsuffix .pb.go,$(PROTO_FILES))
 GRPC_PROTO_GO_FILES := $(addsuffix .pb.go,$(GRPC_PROTO_FILES)) $(addsuffix _grpc.pb.go,$(GRPC_PROTO_FILES))
 TEST_GO_FILES := $(wildcard *_test.go))
-EASYJSON_FILES := $(filter-out $(TEST_GO_FILES),$(wildcard api*.go))
+EASYJSON_FILES := $(filter-out $(TEST_GO_FILES),$(wildcard api*.go talk/ocs.go))
 EASYJSON_GO_FILES := $(patsubst %.go,%_easyjson.go,$(EASYJSON_FILES))
 COMMON_GO_FILES := $(filter-out continentmap.go $(PROTO_GO_FILES) $(GRPC_PROTO_GO_FILES) $(EASYJSON_GO_FILES) $(TEST_GO_FILES),$(wildcard *.go))
 CLIENT_TEST_GO_FILES := $(wildcard client/*_test.go))
diff --git a/api_backend.go b/api_backend.go
index 28b6462..b295d5e 100644
--- a/api_backend.go
+++ b/api_backend.go
@@ -418,24 +418,6 @@ func NewBackendClientSessionRequest(roomid string, action string, sessionid Publ
 	return request
 }
 
-type OcsMeta struct {
-	Status     string `json:"status"`
-	StatusCode int    `json:"statuscode"`
-	Message    string `json:"message"`
-}
-
-type OcsBody struct {
-	Meta OcsMeta         `json:"meta"`
-	Data json.RawMessage `json:"data"`
-}
-
-type OcsResponse struct {
-	json.Marshaler
-	json.Unmarshaler
-
-	Ocs *OcsBody `json:"ocs"`
-}
-
 // See https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
 type TurnCredentials struct {
 	Username string   `json:"username"`
diff --git a/backend_client.go b/backend_client.go
index 826e816..1032d49 100644
--- a/backend_client.go
+++ b/backend_client.go
@@ -35,6 +35,7 @@ import (
 
 	"github.com/strukturag/nextcloud-spreed-signaling/log"
 	"github.com/strukturag/nextcloud-spreed-signaling/pool"
+	"github.com/strukturag/nextcloud-spreed-signaling/talk"
 )
 
 var (
@@ -54,7 +55,7 @@ type BackendClient struct {
 	backends *BackendConfiguration
 
 	pool         *pool.HttpClientPool
-	capabilities *Capabilities
+	capabilities *talk.Capabilities
 	buffers      pool.BufferPool
 }
 
@@ -75,7 +76,7 @@ func NewBackendClient(ctx context.Context, config *goconf.ConfigFile, maxConcurr
 		return nil, err
 	}
 
-	capabilities, err := NewCapabilities(version, pool)
+	capabilities, err := talk.NewCapabilities(version, pool)
 	if err != nil {
 		return nil, err
 	}
@@ -113,10 +114,6 @@ func (b *BackendClient) IsUrlAllowed(u *url.URL) bool {
 	return b.backends.IsUrlAllowed(u)
 }
 
-func isOcsRequest(u *url.URL) bool {
-	return strings.Contains(u.Path, "/ocs/v2.php") || strings.Contains(u.Path, "/ocs/v1.php")
-}
-
 // PerformJSONRequest sends a JSON POST request to the given url and decodes
 // the result into "response".
 func (b *BackendClient) PerformJSONRequest(ctx context.Context, u *url.URL, request any, response any) error {
@@ -131,7 +128,7 @@ func (b *BackendClient) PerformJSONRequest(ctx context.Context, u *url.URL, requ
 	}
 
 	var requestUrl *url.URL
-	if b.capabilities.HasCapabilityFeature(ctx, u, FeatureSignalingV3Api) {
+	if b.capabilities.HasCapabilityFeature(ctx, u, talk.FeatureSignalingV3Api) {
 		newUrl := *u
 		newUrl.Path = strings.ReplaceAll(newUrl.Path, "/spreed/api/v1/signaling/", "/spreed/api/v3/signaling/")
 		newUrl.Path = strings.ReplaceAll(newUrl.Path, "/spreed/api/v2/signaling/", "/spreed/api/v3/signaling/")
@@ -205,7 +202,7 @@ func (b *BackendClient) PerformJSONRequest(ctx context.Context, u *url.URL, requ
 
 	defer b.buffers.Put(body)
 
-	if isOcsRequest(u) || req.Header.Get("OCS-APIRequest") != "" {
+	if talk.IsOcsRequest(u) || req.Header.Get("OCS-APIRequest") != "" {
 		// OCS response are wrapped in an OCS container that needs to be parsed
 		// to get the actual contents:
 		// {
@@ -214,7 +211,7 @@ func (b *BackendClient) PerformJSONRequest(ctx context.Context, u *url.URL, requ
 		//     "data": { ... }
 		//   }
 		// }
-		var ocs OcsResponse
+		var ocs talk.OcsResponse
 		if err := json.Unmarshal(body.Bytes(), &ocs); err != nil {
 			logger.Printf("Could not decode OCS response %s from %s: %s", body.String(), req.URL, err)
 			statsBackendClientError.WithLabelValues(backend.Id(), "error_decoding_ocs").Inc()
diff --git a/backend_client_test.go b/backend_client_test.go
index 3b60930..25625cb 100644
--- a/backend_client_test.go
+++ b/backend_client_test.go
@@ -37,12 +37,13 @@ import (
 
 	"github.com/strukturag/nextcloud-spreed-signaling/log"
 	"github.com/strukturag/nextcloud-spreed-signaling/pool"
+	"github.com/strukturag/nextcloud-spreed-signaling/talk"
 )
 
 func returnOCS(t *testing.T, w http.ResponseWriter, body []byte) {
-	response := OcsResponse{
-		Ocs: &OcsBody{
-			Meta: OcsMeta{
+	response := talk.OcsResponse{
+		Ocs: &talk.OcsBody{
+			Meta: talk.OcsMeta{
 				Status:     "OK",
 				StatusCode: http.StatusOK,
 				Message:    "OK",
@@ -51,7 +52,7 @@ func returnOCS(t *testing.T, w http.ResponseWriter, body []byte) {
 		},
 	}
 	if strings.Contains(t.Name(), "Throttled") {
-		response.Ocs.Meta = OcsMeta{
+		response.Ocs.Meta = talk.OcsMeta{
 			Status:     "failure",
 			StatusCode: 429,
 			Message:    "Reached maximum delay",
diff --git a/client/main.go b/client/main.go
index bbfdd17..5d87f3f 100644
--- a/client/main.go
+++ b/client/main.go
@@ -49,6 +49,7 @@ import (
 
 	signaling "github.com/strukturag/nextcloud-spreed-signaling"
 	"github.com/strukturag/nextcloud-spreed-signaling/internal"
+	"github.com/strukturag/nextcloud-spreed-signaling/talk"
 )
 
 var (
@@ -458,9 +459,9 @@ func registerAuthHandler(router *mux.Router) {
 		}
 
 		rawdata := json.RawMessage(data)
-		payload := &signaling.OcsResponse{
-			Ocs: &signaling.OcsBody{
-				Meta: signaling.OcsMeta{
+		payload := &talk.OcsResponse{
+			Ocs: &talk.OcsBody{
+				Meta: talk.OcsMeta{
 					Status:     "ok",
 					StatusCode: http.StatusOK,
 					Message:    http.StatusText(http.StatusOK),
diff --git a/hub.go b/hub.go
index 917546a..9a3783c 100644
--- a/hub.go
+++ b/hub.go
@@ -56,6 +56,7 @@ import (
 	"github.com/strukturag/nextcloud-spreed-signaling/container"
 	"github.com/strukturag/nextcloud-spreed-signaling/internal"
 	"github.com/strukturag/nextcloud-spreed-signaling/log"
+	"github.com/strukturag/nextcloud-spreed-signaling/talk"
 )
 
 var (
@@ -1403,7 +1404,7 @@ func (h *Hub) processHelloV2(ctx context.Context, client HandlerClient, message
 		tokenString = message.Hello.Auth.helloV2Params.Token
 		tokenClaims = &HelloV2TokenClaims{}
 	case HelloClientTypeFederation:
-		if !h.backend.capabilities.HasCapabilityFeature(ctx, url, FeatureFederationV2) {
+		if !h.backend.capabilities.HasCapabilityFeature(ctx, url, talk.FeatureFederationV2) {
 			return nil, nil, ErrFederationNotSupported
 		}
 
diff --git a/hub_test.go b/hub_test.go
index 2fc6f3a..1ea1fd7 100644
--- a/hub_test.go
+++ b/hub_test.go
@@ -58,6 +58,7 @@ import (
 	"github.com/strukturag/nextcloud-spreed-signaling/internal"
 	"github.com/strukturag/nextcloud-spreed-signaling/log"
 	"github.com/strukturag/nextcloud-spreed-signaling/nats"
+	"github.com/strukturag/nextcloud-spreed-signaling/talk"
 	"github.com/strukturag/nextcloud-spreed-signaling/test"
 )
 
@@ -374,9 +375,9 @@ func validateBackendChecksum(t *testing.T, f func(http.ResponseWriter, *http.Req
 		assert.NoError(err)
 
 		if r.Header.Get("OCS-APIRequest") != "" {
-			var ocs OcsResponse
-			ocs.Ocs = &OcsBody{
-				Meta: OcsMeta{
+			var ocs talk.OcsResponse
+			ocs.Ocs = &talk.OcsBody{
+				Meta: talk.OcsMeta{
 					Status:     "ok",
 					StatusCode: http.StatusOK,
 					Message:    http.StatusText(http.StatusOK),
@@ -778,8 +779,8 @@ func registerBackendHandlerUrl(t *testing.T, router *mux.Router, url string) {
 			"config":   config,
 		})
 		assert.NoError(t, err)
-		response := &CapabilitiesResponse{
-			Version: CapabilitiesVersion{
+		response := &talk.CapabilitiesResponse{
+			Version: talk.CapabilitiesVersion{
 				Major: 20,
 			},
 			Capabilities: map[string]json.RawMessage{
@@ -790,9 +791,9 @@ func registerBackendHandlerUrl(t *testing.T, router *mux.Router, url string) {
 		data, err := json.Marshal(response)
 		assert.NoError(t, err, "Could not marshal %+v", response)
 
-		var ocs OcsResponse
-		ocs.Ocs = &OcsBody{
-			Meta: OcsMeta{
+		var ocs talk.OcsResponse
+		ocs.Ocs = &talk.OcsBody{
+			Meta: talk.OcsMeta{
 				Status:     "ok",
 				StatusCode: http.StatusOK,
 				Message:    http.StatusText(http.StatusOK),
diff --git a/room_ping.go b/room_ping.go
index 38b5930..1034c5d 100644
--- a/room_ping.go
+++ b/room_ping.go
@@ -30,6 +30,7 @@ import (
 
 	"github.com/strukturag/nextcloud-spreed-signaling/internal"
 	"github.com/strukturag/nextcloud-spreed-signaling/log"
+	"github.com/strukturag/nextcloud-spreed-signaling/talk"
 )
 
 type pingEntries struct {
@@ -70,13 +71,13 @@ type RoomPing struct {
 	closer *internal.Closer
 
 	backend      *BackendClient
-	capabilities *Capabilities
+	capabilities *talk.Capabilities
 
 	// +checklocks:mu
 	entries map[string]*pingEntries
 }
 
-func NewRoomPing(backend *BackendClient, capabilities *Capabilities) (*RoomPing, error) {
+func NewRoomPing(backend *BackendClient, capabilities *talk.Capabilities) (*RoomPing, error) {
 	result := &RoomPing{
 		closer:       internal.NewCloser(),
 		backend:      backend,
diff --git a/capabilities.go b/talk/capabilities.go
similarity index 98%
rename from capabilities.go
rename to talk/capabilities.go
index 784c18e..d629d8f 100644
--- a/capabilities.go
+++ b/talk/capabilities.go
@@ -19,7 +19,7 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package signaling
+package talk
 
 import (
 	"context"
@@ -59,6 +59,10 @@ const (
 
 var (
 	ErrUnexpectedHttpStatus = errors.New("unexpected_http_status") // +checklocksignore: Global readonly variable.
+
+	ErrUnsupportedContentType = errors.New("unsupported_content_type") // +checklocksignore: Global readonly variable.
+
+	ErrIncompleteResponse = errors.New("incomplete OCS response") // +checklocksignore: Global readonly variable.
 )
 
 type capabilitiesEntry struct {
diff --git a/capabilities_test.go b/talk/capabilities_test.go
similarity index 99%
rename from capabilities_test.go
rename to talk/capabilities_test.go
index b3980c9..2f64aaa 100644
--- a/capabilities_test.go
+++ b/talk/capabilities_test.go
@@ -19,7 +19,7 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package signaling
+package talk
 
 import (
 	"context"
@@ -46,6 +46,10 @@ import (
 	"github.com/strukturag/nextcloud-spreed-signaling/pool"
 )
 
+const (
+	testTimeout = 10 * time.Second
+)
+
 func NewCapabilitiesForTestWithCallback(t *testing.T, callback func(*CapabilitiesResponse, http.ResponseWriter) error) (*url.URL, *Capabilities) {
 	require := require.New(t)
 	assert := assert.New(t)
diff --git a/talk/ocs.go b/talk/ocs.go
new file mode 100644
index 0000000..32b933c
--- /dev/null
+++ b/talk/ocs.go
@@ -0,0 +1,50 @@
+/**
+ * Standalone signaling server for the Nextcloud Spreed app.
+ * Copyright (C) 2025 struktur AG
+ *
+ * @author Joachim Bauch <bauch@struktur.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package talk
+
+import (
+	"encoding/json"
+	"net/url"
+	"strings"
+)
+
+type OcsMeta struct {
+	Status     string `json:"status"`
+	StatusCode int    `json:"statuscode"`
+	Message    string `json:"message"`
+}
+
+type OcsBody struct {
+	Meta OcsMeta         `json:"meta"`
+	Data json.RawMessage `json:"data"`
+}
+
+type OcsResponse struct {
+	json.Marshaler
+	json.Unmarshaler
+
+	Ocs *OcsBody `json:"ocs"`
+}
+
+func IsOcsRequest(u *url.URL) bool {
+	return strings.Contains(u.Path, "/ocs/v2.php") || strings.Contains(u.Path, "/ocs/v1.php")
+}