From 19d674f5316e6cbf45f25676a584545e81434b7f Mon Sep 17 00:00:00 2001
From: Dave Horton <daveh@beachdognet.com>
Date: Tue, 25 Feb 2020 11:36:18 -0500
Subject: [PATCH] bugfix: _evalUnansweredCallPrecondition should be checking
 res.finalResponseSent

---
 lib/session/call-session.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/session/call-session.js b/lib/session/call-session.js
index 154a09ab..d378c932 100644
--- a/lib/session/call-session.js
+++ b/lib/session/call-session.js
@@ -475,7 +475,7 @@ class CallSession extends Emitter {
   _evalUnansweredCallPrecondition(task, callSid) {
     if (!this.req) throw new Error('invalid precondition unanswered_call for outbound call');
     if (this.callGone) new Error(`${BADPRECONDITIONS}: call gone`);
-    if (this.req.finalResponseSent) {
+    if (this.res.finalResponseSent) {
       throw new Error(`${BADPRECONDITIONS}: final sip status already sent`);
     }
     return {req: this.req, res: this.res};