diff --git a/lib/session/call-session.js b/lib/session/call-session.js
index ac98340f..dba3d1c2 100644
--- a/lib/session/call-session.js
+++ b/lib/session/call-session.js
@@ -632,7 +632,7 @@ class CallSession extends Emitter {
     try {
       if (!this.ms) this.ms = this.getMS();
       const ep = await this.ms.createEndpoint({remoteSdp: this.req.body});
-      ep.cs = this;
+      //ep.cs = this;
       this.ep = ep;
       ep.set({
         hangup_after_bridge: false,
@@ -716,14 +716,15 @@ class CallSession extends Emitter {
   /**
    * Hang up the call and free the media endpoint
    */
-  async _clearResources() {
+  _clearResources() {
     for (const resource of [this.dlg, this.ep]) {
-      try {
-        if (resource && resource.connected) await resource.destroy();
-      } catch (err) {
-        this.logger.error(err, 'CallSession:_clearResources error');
+      if (resource && resource.connected) {
+        resource.destroy()
+          .catch((err) => this.logger.error(err, 'CallSession:_clearResources error'));
       }
     }
+    this.dlg = null;
+    this.ep = null;
 
     // remove any temporary tts files that were created (audio is still cached in redis)
     for (const path of this.tmpFiles) {
diff --git a/lib/session/inbound-call-session.js b/lib/session/inbound-call-session.js
index 3581d2c1..e72ece47 100644
--- a/lib/session/inbound-call-session.js
+++ b/lib/session/inbound-call-session.js
@@ -21,15 +21,17 @@ class InboundCallSession extends CallSession {
     this.req = req;
     this.res = res;
 
-    req.on('cancel', () => {
-      this._notifyCallStatusChange({callStatus: CallStatus.NoAnswer, sipStatus: 487});
-      this._callReleased();
-    });
+    req.once('cancel', this._onCancel.bind(this));
 
     this.on('callStatusChange', this._notifyCallStatusChange.bind(this));
     this._notifyCallStatusChange({callStatus: CallStatus.Trying, sipStatus: 100});
   }
 
+  _onCancel() {
+    this._notifyCallStatusChange({callStatus: CallStatus.NoAnswer, sipStatus: 487});
+    this._callReleased();
+  }
+
   _onTasksDone() {
     if (!this.res.finalResponseSent) {
       if (this._mediaServerFailure) {
@@ -45,6 +47,7 @@ class InboundCallSession extends CallSession {
         this.res.send(603);
       }
     }
+    this.req.removeAllListeners('cancel');
   }
 
   /**
@@ -56,6 +59,7 @@ class InboundCallSession extends CallSession {
     this.emit('callStatusChange', {callStatus: CallStatus.Completed, duration});
     this.logger.debug('InboundCallSession: caller hung up');
     this._callReleased();
+    this.req.removeAllListeners('cancel');
   }
 }
 
diff --git a/lib/tasks/dial.js b/lib/tasks/dial.js
index 67f3ca82..0bef8dcb 100644
--- a/lib/tasks/dial.js
+++ b/lib/tasks/dial.js
@@ -448,6 +448,12 @@ class TaskDial extends Task {
     this._killOutdials();       // NB: order is important
   }
 
+  _onMaxCallDuration(cs) {
+    this.logger.info(`Dial:_onMaxCallDuration tearing down call as it has reached ${this.timeLimit}s`);
+    this.ep && this.ep.unbridge();
+    this.kill(cs);
+  }
+
   /**
    * We now have a call leg produced by the Dial action, so
    * - hangup any simrings in progress
@@ -468,11 +474,7 @@ class TaskDial extends Task {
       await cs.propagateAnswer();
     }
     if (this.timeLimit) {
-      this.timerMaxCallDuration = setTimeout(() => {
-        this.logger.info(`Dial:_selectSingleDial tearing down call as it has reached ${this.timeLimit}s`);
-        this.ep && this.ep.unbridge();
-        this.kill(cs);
-      }, this.timeLimit * 1000);
+      this.timerMaxCallDuration = setTimeout(this._onMaxCallDuration.bind(this, cs), this.timeLimit * 1000);
     }
     sessionTracker.add(this.callSid, cs);
     this.dlg.on('destroy', () => {