diff --git a/lib/Controller/PageController.php b/lib/Controller/PageController.php
index 07486a26a..6680d0000 100644
--- a/lib/Controller/PageController.php
+++ b/lib/Controller/PageController.php
@@ -111,7 +111,7 @@ public function index(): TemplateResponse {
 		$talkVersion = $this->appManager->getAppVersion('spreed');
 		$isTalkEnabled = $this->appManager->isEnabledForUser('spreed') === true;
 
-		$isTalkVersionCompatible = $this->compareVersion->isCompatible($talkVersion ? $talkVersion : '0.0.0', 15);
+		$isTalkVersionCompatible = $this->compareVersion->isCompatible($talkVersion ? $talkVersion : '0.0.0', 2);
 
 		$this->initialStateService->provideInitialState(Application::APP_ID, 'isGroupSharingEnabled', $isGroupSharingEnabled);
 		$this->initialStateService->provideInitialState(Application::APP_ID, 'locales', $locales);
diff --git a/src/components/ContactDetails.vue b/src/components/ContactDetails.vue
index 156086597..edba6c572 100644
--- a/src/components/ContactDetails.vue
+++ b/src/components/ContactDetails.vue
@@ -228,7 +228,7 @@
 						</template>
 						<ActionLink v-for="emailAddress in emailAddressList"
 							:key="emailAddress"
-							:href="'email:' + emailAddress">
+							:href="'mailto:' + emailAddress">
 							<template #icon>
 								<IconMail :size="20" />
 							</template>
@@ -248,7 +248,7 @@
 							{{ phoneNumber }}
 						</ActionLink>
 					</Actions>
-					<NcButton v-if="isTalkEnabled"
+					<NcButton v-if="isTalkEnabled && isInSystemAddressBook"
 						class="icon-talk"
 						:href="callUrl" />
 
@@ -664,6 +664,9 @@ export default {
 		callUrl() {
 			return generateUrl('/apps/spreed/?callUser={uid}', { uid: this.contact.uid })
 		},
+		isInSystemAddressBook() {
+			return this.contact.addressbook.id === 'z-server-generated--system'
+		},
 	},
 
 	watch: {
diff --git a/src/models/rfcProps.js b/src/models/rfcProps.js
index 8eb663cb6..b496b7f03 100644
--- a/src/models/rfcProps.js
+++ b/src/models/rfcProps.js
@@ -290,7 +290,7 @@ const properties = {
 			{ id: 'YOUTUBE', name: 'YouTube', placeholder: 'https://youtube.com/…' },
 			{ id: 'MASTODON', name: 'Mastodon', placeholder: 'https://mastodon.social/…' },
 			{ id: 'DIASPORA', name: 'Diaspora', placeholder: 'https://joindiaspora.com/…' },
-			{ id: 'NEXTCLOUD', name: 'Nextcloud', placeholder: 'https://nextcloud.example.com/…' },
+			{ id: 'NEXTCLOUD', name: 'Nextcloud', placeholder: 'Link to profile page (https://nextcloud.example.com/…)' },
 			{ id: 'OTHER', name: 'Other', placeholder: 'https://example.com/…' },
 		],
 		primary: true,