diff --git a/frontend/pages/communication/phone.vue b/frontend/pages/communication/phone.vue
index c620bda..0ed50a8 100644
--- a/frontend/pages/communication/phone.vue
+++ b/frontend/pages/communication/phone.vue
@@ -22,6 +22,7 @@ const sipStatus = ref("Nicht verbunden")
 const sipError = ref(null)
 const incomingCall = ref(null)
 const callState = ref("idle")
+const registererState = ref("Initial")
 
 const selectedAccount = computed(() =>
   (config.value?.testAccounts || []).find((account) => account.extension === selectedExtension.value)
@@ -227,6 +228,7 @@ const stopSip = async () => {
     }
 
     sipRegistered.value = false
+    registererState.value = "Initial"
     sipStatus.value = "Nicht verbunden"
     callState.value = "idle"
   } catch (error) {
@@ -251,12 +253,33 @@ const registerSip = async () => {
 
     if (!uri) throw new Error("SIP-URI konnte nicht erstellt werden.")
 
+    const handleIncomingInvite = (invitation) => {
+      incomingCall.value = invitation
+      setupSession(invitation, "incoming")
+
+      toast.add({
+        title: "Eingehender Anruf",
+        description: `Anruf für ${account.extension}`,
+        color: "primary"
+      })
+    }
+
     const ua = new sip.UserAgent({
       uri,
       displayName: account.displayName,
       contactName: account.extension,
       authorizationUsername: account.extension,
       authorizationPassword: account.password,
+      delegate: {
+        onInvite: handleIncomingInvite,
+        onConnect: () => {
+          sipStatus.value = sipRegistered.value ? `Registriert als ${account.extension}` : "SIP-WebSocket verbunden"
+        },
+        onDisconnect: () => {
+          sipRegistered.value = false
+          sipStatus.value = "SIP-WebSocket getrennt"
+        },
+      },
       transportOptions: {
         server: config.value.sipWebSocketUrl,
       },
@@ -271,23 +294,42 @@ const registerSip = async () => {
       },
     })
 
-    ua.delegate = {
-      onInvite(invitation) {
-        incomingCall.value = invitation
-        setupSession(invitation, "incoming")
-      },
-    }
+    const reg = new sip.Registerer(ua, {
+      expires: 120,
+    })
 
-    const reg = new sip.Registerer(ua)
+    reg.stateChange.addListener((state) => {
+      registererState.value = state
+
+      if (state === sip.RegistererState.Registered) {
+        sipRegistered.value = true
+        sipStatus.value = `Registriert als ${account.extension}`
+      }
+
+      if (state === sip.RegistererState.Unregistered || state === sip.RegistererState.Terminated) {
+        sipRegistered.value = false
+        sipStatus.value = "Nicht verbunden"
+      }
+    })
 
     userAgent.value = ua
     registerer.value = reg
 
     await ua.start()
-    await reg.register()
-
-    sipRegistered.value = true
-    sipStatus.value = `Registriert als ${account.extension}`
+    await reg.register({
+      requestDelegate: {
+        onAccept: () => {
+          sipRegistered.value = true
+          sipStatus.value = `Registriert als ${account.extension}`
+          registererState.value = sip.RegistererState.Registered
+        },
+        onReject: (response) => {
+          sipRegistered.value = false
+          sipStatus.value = "Registrierung abgelehnt"
+          sipError.value = `Asterisk hat REGISTER mit HTTP/SIP ${response.message.statusCode} abgelehnt.`
+        },
+      },
+    })
   } catch (error) {
     sipRegistered.value = false
     sipStatus.value = "Nicht verbunden"
@@ -529,6 +571,9 @@ onBeforeUnmount(() => {
               <UBadge color="neutral" variant="soft">
                 {{ callState === "active" ? "Aktiver Anruf" : callState === "connecting" ? "Verbindet" : callState === "incoming" ? "Eingehend" : "Bereit" }}
               </UBadge>
+              <UBadge :color="sipRegistered ? 'success' : 'warning'" variant="soft">
+                Registrierung: {{ registererState }}
+              </UBadge>
             </div>
 
             <UAlert