diff --git a/src/input/Toggle.jsx b/src/input/Toggle.jsx
new file mode 100644
index 00000000..3f5208b9
--- /dev/null
+++ b/src/input/Toggle.jsx
@@ -0,0 +1,36 @@
+import React, { useRef } from "react";
+import styles from "./Toggle.module.css";
+import { useToggleButton } from "@react-aria/button";
+import { useToggleState } from "@react-stately/toggle";
+import classNames from "classnames";
+import { Field } from "./Input";
+
+export function Toggle({ id, label, className, ...rest }) {
+  const buttonRef = useRef();
+  const state = useToggleState(rest);
+  const { buttonProps, isPressed } = useToggleButton(rest, state, buttonRef);
+
+  return (
+    <Field
+      className={classNames(
+        styles.toggle,
+        { [styles.on]: isPressed },
+        className
+      )}
+    >
+      <button
+        {...buttonProps}
+        ref={buttonRef}
+        id={id}
+        className={classNames(styles.button, {
+          [styles.isPressed]: isPressed,
+        })}
+      >
+        <div className={styles.ball} />
+      </button>
+      <label className={styles.label} htmlFor={id}>
+        {label}
+      </label>
+    </Field>
+  );
+}
diff --git a/src/input/Toggle.module.css b/src/input/Toggle.module.css
new file mode 100644
index 00000000..8e2dad50
--- /dev/null
+++ b/src/input/Toggle.module.css
@@ -0,0 +1,46 @@
+.toggle {
+  align-items: center;
+  margin-bottom: 20px;
+}
+
+.button {
+  position: relative;
+  padding: 0;
+  transition: background-color 0.20s ease-out 0.1s;
+  width: 44px;
+  height: 24px;
+  border: none;
+  border-radius: 21px;
+  background-color: #6F7882;
+  cursor: pointer;
+  margin-right: 8px;
+}
+
+.ball {
+  transition: left 0.15s ease-out 0.1s;
+  position: absolute;
+  width: 20px;
+  height: 20px;
+  border-radius: 21px;
+  background-color: #15191E;
+  left: 2px;
+  top: 2px;
+}
+
+.label {
+  padding: 10px 8px;
+  line-height: 24px;
+  color: #6F7882;
+}
+
+.toggle.on .button {
+  background-color: #0DBD8B;
+}
+
+.toggle.on .ball {
+  left: 22px;
+}
+
+.toggle.on .label {
+  color: #ffffff;
+}
\ No newline at end of file
diff --git a/src/room/GroupCallView.jsx b/src/room/GroupCallView.jsx
index e4780a3f..b8052d6b 100644
--- a/src/room/GroupCallView.jsx
+++ b/src/room/GroupCallView.jsx
@@ -77,18 +77,15 @@ export function GroupCallView({
     if (groupCall.isPtt) {
       return (
         <PTTCallView
+          client={client}
+          roomId={roomId}
+          roomName={groupCall.room.name}
           groupCall={groupCall}
           participants={participants}
-          client={client}
-          roomName={groupCall.room.name}
-          microphoneMuted={microphoneMuted}
-          toggleMicrophoneMuted={toggleMicrophoneMuted}
           userMediaFeeds={userMediaFeeds}
-          activeSpeaker={activeSpeaker}
           onLeave={onLeave}
           setShowInspector={onChangeShowInspector}
           showInspector={showInspector}
-          roomId={roomId}
         />
       );
     } else {
diff --git a/src/room/PTTButton.jsx b/src/room/PTTButton.jsx
index d943ae48..1e0ba2fd 100644
--- a/src/room/PTTButton.jsx
+++ b/src/room/PTTButton.jsx
@@ -1,41 +1,41 @@
-import classNames from "classnames";
 import React from "react";
+import classNames from "classnames";
 import styles from "./PTTButton.module.css";
 import { ReactComponent as MicIcon } from "../icons/Mic.svg";
 import { Avatar } from "../Avatar";
 
-export function PTTButton({ client, activeSpeaker }) {
-  const size = 232;
-
-  const isLocal = client.userId === activeSpeaker;
-  const avatarUrl = activeSpeaker?.user?.avatarUrl;
-
+export function PTTButton({
+  showTalkOverError,
+  activeSpeakerUserId,
+  activeSpeakerDisplayName,
+  activeSpeakerAvatarUrl,
+  activeSpeakerIsLocalUser,
+  size,
+}) {
   return (
     <button
       className={classNames(styles.pttButton, {
-        [styles.speaking]: !!activeSpeaker,
+        [styles.talking]: activeSpeakerUserId,
+        [styles.error]: showTalkOverError,
       })}
     >
-      {isLocal || !avatarUrl || !activeSpeaker ? (
+      {activeSpeakerIsLocalUser || !activeSpeakerUserId ? (
         <MicIcon
-          classNames={styles.micIcon}
+          className={styles.micIcon}
           width={size / 3}
           height={size / 3}
         />
       ) : (
         <Avatar
-          key={activeSpeaker.userId}
+          key={activeSpeakerUserId}
           style={{
-            width: size,
-            height: size,
-            borderRadius: size,
-            fontSize: Math.round(size / 2),
+            width: size - 12,
+            height: size - 12,
+            borderRadius: size - 12,
+            fontSize: Math.round((size - 12) / 2),
           }}
-          src={
-            activeSpeaker.user.avatarUrl &&
-            getAvatarUrl(client, activeSpeaker.user.avatarUrl, size)
-          }
-          fallback={activeSpeaker.name.slice(0, 1).toUpperCase()}
+          src={activeSpeakerAvatarUrl}
+          fallback={activeSpeakerDisplayName.slice(0, 1).toUpperCase()}
           className={styles.avatar}
         />
       )}
diff --git a/src/room/PTTButton.module.css b/src/room/PTTButton.module.css
index 6bfc1a10..447e1190 100644
--- a/src/room/PTTButton.module.css
+++ b/src/room/PTTButton.module.css
@@ -4,8 +4,20 @@
   max-height: 232px;
   max-width: 232px;
   border-radius: 116px;
-  
   color: ##fff;
   border: 6px solid #0dbd8b;
   background-color: #21262C;
+  position: relative;
+  padding: 0;
+}
+
+.talking {
+  background-color: #0dbd8b;
+  box-shadow: 0px 0px 0px 17px rgba(13, 189, 139, 0.2), 0px 0px 0px 34px rgba(13, 189, 139, 0.2);
+}
+
+.error {
+  background-color: #FF5B55;
+  border-color: #FF5B55;
+  box-shadow: 0px 0px 0px 17px rgba(255, 91, 85, 0.2), 0px 0px 0px 34px rgba(255, 91, 85, 0.2);
 }
\ No newline at end of file
diff --git a/src/room/PTTCallView.jsx b/src/room/PTTCallView.jsx
index cd2b04ed..55187e08 100644
--- a/src/room/PTTCallView.jsx
+++ b/src/room/PTTCallView.jsx
@@ -2,10 +2,8 @@ import React from "react";
 import { useModalTriggerState } from "../Modal";
 import { SettingsModal } from "../settings/SettingsModal";
 import { InviteModal } from "./InviteModal";
-import { Button, HangupButton, InviteButton, SettingsButton } from "../button";
+import { HangupButton, InviteButton, SettingsButton } from "../button";
 import { Header, LeftNav, RightNav, RoomSetupHeaderInfo } from "../Header";
-import { ReactComponent as AddUserIcon } from "../icons/AddUser.svg";
-import { ReactComponent as SettingsIcon } from "../icons/Settings.svg";
 import styles from "./PTTCallView.module.css";
 import { Facepile } from "../Facepile";
 import { PTTButton } from "./PTTButton";
@@ -13,28 +11,59 @@ import { PTTFeed } from "./PTTFeed";
 import { useMediaHandler } from "../settings/useMediaHandler";
 import useMeasure from "react-use-measure";
 import { ResizeObserver } from "@juggle/resize-observer";
+import { usePTT } from "./usePTT";
+import { Timer } from "./Timer";
+import { Toggle } from "../input/Toggle";
+import { getAvatarUrl } from "../matrix-utils";
+import { ReactComponent as AudioIcon } from "../icons/Audio.svg";
 
 export function PTTCallView({
+  client,
+  roomId,
+  roomName,
   groupCall,
   participants,
-  client,
-  roomName,
-  microphoneMuted,
-  toggleMicrophoneMuted,
   userMediaFeeds,
-  activeSpeaker,
   onLeave,
   setShowInspector,
   showInspector,
-  roomId,
 }) {
   const { modalState: inviteModalState, modalProps: inviteModalProps } =
     useModalTriggerState();
   const { modalState: settingsModalState, modalProps: settingsModalProps } =
     useModalTriggerState();
-  const { audioOutput } = useMediaHandler();
   const [containerRef, bounds] = useMeasure({ polyfill: ResizeObserver });
   const facepileSize = bounds.width < 800 ? "sm" : "md";
+  const pttButtonSize = 232;
+  const pttBorderWidth = 6;
+
+  const { audioOutput } = useMediaHandler();
+
+  const {
+    pttButtonHeld,
+    isAdmin,
+    talkOverEnabled,
+    setTalkOverEnabled,
+    activeSpeakerUserId,
+  } = usePTT(client, groupCall, userMediaFeeds);
+
+  const activeSpeakerIsLocalUser =
+    activeSpeakerUserId && client.getUserId() === activeSpeakerUserId;
+  const showTalkOverError =
+    pttButtonHeld && !activeSpeakerIsLocalUser && !talkOverEnabled;
+  const activeSpeakerUser = activeSpeakerUserId
+    ? client.getUser(activeSpeakerUserId)
+    : null;
+  const activeSpeakerAvatarUrl = activeSpeakerUser
+    ? getAvatarUrl(
+        client,
+        activeSpeakerUser.avatarUrl,
+        pttButtonSize - pttBorderWidth * 2
+      )
+    : null;
+  const activeSpeakerDisplayName = activeSpeakerUser
+    ? activeSpeakerUser.displayName
+    : "";
 
   return (
     <div className={styles.pttCallView} ref={containerRef}>
@@ -64,16 +93,40 @@ export function PTTCallView({
         </div>
 
         <div className={styles.pttButtonContainer}>
-          <div className={styles.talkingInfo}>
-            <h2>Talking...</h2>
-            <p>00:01:24</p>
-          </div>
+          {activeSpeakerUserId ? (
+            <div className={styles.talkingInfo}>
+              <h2>
+                {!activeSpeakerIsLocalUser && (
+                  <AudioIcon className={styles.speakerIcon} />
+                )}
+                {activeSpeakerIsLocalUser
+                  ? "Talking..."
+                  : `${activeSpeakerDisplayName} is talking...`}
+              </h2>
+              <Timer value={activeSpeakerUserId} />
+            </div>
+          ) : (
+            <div className={styles.talkingInfo} />
+          )}
           <PTTButton
-            client={client}
-            activeSpeaker={activeSpeaker}
-            groupCall={groupCall}
+            showTalkOverError={showTalkOverError}
+            activeSpeakerUserId={activeSpeakerUserId}
+            activeSpeakerDisplayName={activeSpeakerDisplayName}
+            activeSpeakerAvatarUrl={activeSpeakerAvatarUrl}
+            activeSpeakerIsLocalUser={activeSpeakerIsLocalUser}
+            size={pttButtonSize}
           />
-          <p className={styles.actionTip}>Press and hold spacebar to talk</p>
+          <p className={styles.actionTip}>
+            {showTalkOverError
+              ? "You can't talk at the same time"
+              : pttButtonHeld
+              ? "Release spacebar key to stop"
+              : talkOverEnabled &&
+                activeSpeakerUserId &&
+                !activeSpeakerIsLocalUser
+              ? `Press and hold spacebar to talk over ${activeSpeakerDisplayName}`
+              : "Press and hold spacebar to talk"}
+          </p>
           {userMediaFeeds.map((callFeed) => (
             <PTTFeed
               key={callFeed.userId}
@@ -81,6 +134,14 @@ export function PTTCallView({
               audioOutputDevice={audioOutput}
             />
           ))}
+          {isAdmin && (
+            <Toggle
+              isSelected={talkOverEnabled}
+              onChange={setTalkOverEnabled}
+              label="Talk over speaker"
+              id="talkOverEnabled"
+            />
+          )}
         </div>
       </div>
 
diff --git a/src/room/PTTCallView.module.css b/src/room/PTTCallView.module.css
index 56c41964..0da2ed22 100644
--- a/src/room/PTTCallView.module.css
+++ b/src/room/PTTCallView.module.css
@@ -38,6 +38,11 @@
   flex-direction: column;
   align-items: center;
   margin-bottom: 20px;
+  height: 88px;
+}
+
+.speakerIcon {
+  margin-right: 8px;
 }
 
 .pttButtonContainer {
diff --git a/src/room/Timer.jsx b/src/room/Timer.jsx
new file mode 100644
index 00000000..bed43834
--- /dev/null
+++ b/src/room/Timer.jsx
@@ -0,0 +1,37 @@
+import React, { useEffect, useState } from "react";
+
+function leftPad(value) {
+  return value < 10 ? "0" + value : value;
+}
+
+function formatTime(msElapsed) {
+  const secondsElapsed = msElapsed / 1000;
+  const hours = Math.floor(secondsElapsed / 3600);
+  const minutes = Math.floor(secondsElapsed / 60) - hours * 60;
+  const seconds = Math.floor(secondsElapsed - hours * 3600 - minutes * 60);
+  return `${leftPad(hours)}:${leftPad(minutes)}:${leftPad(seconds)}`;
+}
+
+export function Timer({ value }) {
+  const [timestamp, setTimestamp] = useState();
+
+  useEffect(() => {
+    const startTimeMs = performance.now();
+
+    let animationFrame;
+
+    function onUpdate(curTimeMs) {
+      const msElapsed = curTimeMs - startTimeMs;
+      setTimestamp(formatTime(msElapsed));
+      animationFrame = requestAnimationFrame(onUpdate);
+    }
+
+    onUpdate(startTimeMs);
+
+    return () => {
+      cancelAnimationFrame(animationFrame);
+    };
+  }, [value]);
+
+  return <p>{timestamp}</p>;
+}
diff --git a/src/room/usePTT.js b/src/room/usePTT.js
new file mode 100644
index 00000000..5ba91ea7
--- /dev/null
+++ b/src/room/usePTT.js
@@ -0,0 +1,111 @@
+import { useCallback, useEffect, useState } from "react";
+
+export function usePTT(client, groupCall, userMediaFeeds) {
+  const [
+    { pttButtonHeld, isAdmin, talkOverEnabled, activeSpeakerUserId },
+    setState,
+  ] = useState(() => {
+    const roomMember = groupCall.room.getMember(client.getUserId());
+
+    const activeSpeakerFeed = userMediaFeeds.find((f) => !f.isAudioMuted());
+
+    return {
+      isAdmin: roomMember.powerLevel >= 100,
+      talkOverEnabled: false,
+      pttButtonHeld: false,
+      activeSpeakerUserId: activeSpeakerFeed ? activeSpeakerFeed.userId : null,
+    };
+  });
+
+  useEffect(() => {
+    function onMuteStateChanged(...args) {
+      const activeSpeakerFeed = userMediaFeeds.find((f) => !f.isAudioMuted());
+
+      setState((prevState) => ({
+        ...prevState,
+        activeSpeakerUserId: activeSpeakerFeed
+          ? activeSpeakerFeed.userId
+          : null,
+      }));
+    }
+
+    for (const callFeed of userMediaFeeds) {
+      callFeed.addListener("mute_state_changed", onMuteStateChanged);
+    }
+
+    const activeSpeakerFeed = userMediaFeeds.find((f) => !f.isAudioMuted());
+
+    setState((prevState) => ({
+      ...prevState,
+      activeSpeakerUserId: activeSpeakerFeed ? activeSpeakerFeed.userId : null,
+    }));
+
+    return () => {
+      for (const callFeed of userMediaFeeds) {
+        callFeed.removeListener("mute_state_changed", onMuteStateChanged);
+      }
+    };
+  }, [userMediaFeeds]);
+
+  useEffect(() => {
+    function onKeyDown(event) {
+      if (event.code === "Space") {
+        event.preventDefault();
+
+        if (!activeSpeakerUserId || isAdmin || talkOverEnabled) {
+          if (groupCall.isMicrophoneMuted()) {
+            groupCall.setMicrophoneMuted(false);
+          }
+
+          setState((prevState) => ({ ...prevState, pttButtonHeld: true }));
+        }
+      }
+    }
+
+    function onKeyUp(event) {
+      if (event.code === "Space") {
+        event.preventDefault();
+
+        if (!groupCall.isMicrophoneMuted()) {
+          groupCall.setMicrophoneMuted(true);
+        }
+
+        setState((prevState) => ({ ...prevState, pttButtonHeld: false }));
+      }
+    }
+
+    function onBlur() {
+      // TODO: We will need to disable this for a global PTT hotkey to work
+      if (!groupCall.isMicrophoneMuted()) {
+        groupCall.setMicrophoneMuted(true);
+      }
+
+      setState((prevState) => ({ ...prevState, pttButtonHeld: false }));
+    }
+
+    window.addEventListener("keydown", onKeyDown);
+    window.addEventListener("keyup", onKeyUp);
+    window.addEventListener("blur", onBlur);
+
+    return () => {
+      window.removeEventListener("keydown", onKeyDown);
+      window.removeEventListener("keyup", onKeyUp);
+      window.removeEventListener("blur", onBlur);
+    };
+  }, [activeSpeakerUserId, isAdmin, talkOverEnabled]);
+
+  const setTalkOverEnabled = useCallback((talkOverEnabled) => {
+    setState((prevState) => ({
+      ...prevState,
+      talkOverEnabled,
+    }));
+  }, []);
+
+  return {
+    pttButtonHeld,
+    isAdmin,
+    talkOverEnabled,
+    setTalkOverEnabled,
+    activeSpeakerUserId,
+  };
+}