diff --git a/src/client.ts b/src/client.ts
index 0885554872a..0fab62a30ae 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1322,6 +1322,7 @@ export class MatrixClient extends EventEmitter {
     public async createGroupCall(
         roomId: string,
         type: GroupCallType,
+        isPtt, boolean,
         intent: GroupCallIntent,
         dataChannelsEnabled?: boolean,
         dataChannelOptions?: IGroupCallDataChannelOptions,
@@ -1340,6 +1341,7 @@ export class MatrixClient extends EventEmitter {
             this,
             room,
             type,
+            isPtt,
             intent,
             undefined,
             dataChannelsEnabled,
diff --git a/src/webrtc/groupCall.ts b/src/webrtc/groupCall.ts
index 45ccb6099cf..f648343129a 100644
--- a/src/webrtc/groupCall.ts
+++ b/src/webrtc/groupCall.ts
@@ -134,6 +134,7 @@ export class GroupCall extends EventEmitter {
         private client: MatrixClient,
         public room: Room,
         public type: GroupCallType,
+        public isPtt: boolean,
         public intent: GroupCallIntent,
         groupCallId?: string,
         private dataChannelsEnabled?: boolean,
@@ -160,6 +161,7 @@ export class GroupCall extends EventEmitter {
             {
                 "m.intent": this.intent,
                 "m.type": this.type,
+                "io.element.ptt": this.isPtt,
                 // TODO: Specify datachannels
                 "dataChannelsEnabled": this.dataChannelsEnabled,
                 "dataChannelOptions": this.dataChannelOptions,
@@ -208,6 +210,11 @@ export class GroupCall extends EventEmitter {
             throw error;
         }
 
+        // start muted on ptt calls
+        if (this.isPtt) {
+            setTracksEnabled(stream.getAudioTracks(), false);
+        }
+
         const userId = this.client.getUserId();
 
         const callFeed = new CallFeed({
@@ -216,7 +223,7 @@ export class GroupCall extends EventEmitter {
             userId,
             stream,
             purpose: SDPStreamMetadataPurpose.Usermedia,
-            audioMuted: stream.getAudioTracks().length === 0,
+            audioMuted: stream.getAudioTracks().length === 0 || this.isPtt,
             videoMuted: stream.getVideoTracks().length === 0,
         });
 
diff --git a/src/webrtc/groupCallEventHandler.ts b/src/webrtc/groupCallEventHandler.ts
index 99e726f1f1c..476d0acfabd 100644
--- a/src/webrtc/groupCallEventHandler.ts
+++ b/src/webrtc/groupCallEventHandler.ts
@@ -93,6 +93,8 @@ export class GroupCallEventHandler {
             return;
         }
 
+        const isPtt = Boolean(content["io.element.ptt"]);
+
         let dataChannelOptions: IGroupCallDataChannelOptions | undefined;
 
         if (content?.dataChannelsEnabled && content?.dataChannelOptions) {
@@ -105,6 +107,7 @@ export class GroupCallEventHandler {
             this.client,
             room,
             callType,
+            isPtt,
             callIntent,
             groupCallId,
             content?.dataChannelsEnabled,