diff --git a/addons/mail/static/src/components/rtc_configuration_menu/rtc_configuration_menu.js b/addons/mail/static/src/components/rtc_configuration_menu/rtc_configuration_menu.js
index aa05c9938a7..a60761d4b0d 100644
--- a/addons/mail/static/src/components/rtc_configuration_menu/rtc_configuration_menu.js
+++ b/addons/mail/static/src/components/rtc_configuration_menu/rtc_configuration_menu.js
@@ -32,7 +32,7 @@ export class RtcConfigurationMenu extends Component {
      * @param {Event} ev
      */
     _onChangeDelay(ev) {
-        this.messaging.rtcConfigurationMenu.onChangeDelay(ev.target.value);
+        this.messaging.userSetting.rtcConfigurationMenu.onChangeDelay(ev.target.value);
     }
 
     /**
@@ -40,7 +40,7 @@ export class RtcConfigurationMenu extends Component {
      * @param {Event} ev
      */
     _onChangePushToTalk(ev) {
-        this.messaging.rtcConfigurationMenu.onChangePushToTalk();
+        this.messaging.userSetting.rtcConfigurationMenu.onChangePushToTalk();
     }
 
     /**
@@ -48,7 +48,7 @@ export class RtcConfigurationMenu extends Component {
      * @param {Event} ev
      */
     _onChangeSelectAudioInput(ev) {
-        this.messaging.rtcConfigurationMenu.onChangeSelectAudioInput(ev.target.value);
+        this.messaging.userSetting.rtcConfigurationMenu.onChangeSelectAudioInput(ev.target.value);
     }
 
     /**
@@ -56,7 +56,7 @@ export class RtcConfigurationMenu extends Component {
      * @param {Event} ev
      */
     _onChangeThreshold(ev) {
-        this.messaging.rtcConfigurationMenu.onChangeThreshold(ev.target.value);
+        this.messaging.userSetting.rtcConfigurationMenu.onChangeThreshold(ev.target.value);
     }
 
     /**
@@ -64,7 +64,7 @@ export class RtcConfigurationMenu extends Component {
      * @param {MouseEvent} ev
      */
     _onClickRegisterKeyButton() {
-        this.messaging.rtcConfigurationMenu.onClickRegisterKeyButton();
+        this.messaging.userSetting.rtcConfigurationMenu.onClickRegisterKeyButton();
     }
 }
 
diff --git a/addons/mail/static/src/models/user_setting/user_setting.js b/addons/mail/static/src/models/user_setting/user_setting.js
index a5404b90c66..31477bf0675 100644
--- a/addons/mail/static/src/models/user_setting/user_setting.js
+++ b/addons/mail/static/src/models/user_setting/user_setting.js
@@ -127,7 +127,9 @@ function factory(dependencies) {
         setDelayValue(value) {
             const voiceActiveDuration = parseInt(value, 10);
             this.update({ voiceActiveDuration });
-            this._saveSettings();
+            if (!this.messaging.isCurrentUserGuest) {
+                this._saveSettings();
+            }
         }
 
         /**
@@ -136,7 +138,9 @@ function factory(dependencies) {
         async setPushToTalkKey(ev) {
             const pushToTalkKey = `${ev.shiftKey || ''}.${ev.ctrlKey || ev.metaKey || ''}.${ev.altKey || ''}.${ev.key}`;
             this.update({ pushToTalkKey });
-            this._saveSettings();
+            if (!this.messaging.isCurrentUserGuest) {
+                this._saveSettings();
+            }
         }
 
         /**
@@ -172,7 +176,9 @@ function factory(dependencies) {
         async togglePushToTalk() {
             this.update({ usePushToTalk: !this.usePushToTalk });
             await this.messaging.rtc.updateVoiceActivation();
-            this._saveSettings();
+            if (!this.messaging.isCurrentUserGuest) {
+                this._saveSettings();
+            }
         }
 
         toggleLayoutSettingsWindow() {