Update call-ended-reason.mdx

Author: nikhilro

calls/call-ended-reason.mdx

@@ -37,7 +37,7 @@ These relate to issues within the AI processing pipeline or the Large Language M
 
 - **customer-busy**: The called party's line was busy.
 - **customer-ended-call**: The called party ended the call.
-- **customer-did-not-answer**: The called party didn't answer the call.
+- **customer-did-not-answer**: The called party didn't answer the call. If you're looking to build a usecase where you need the bot to talk to automated IVRs, set `voicemailDetectionEnabled=false`.
 - **customer-did-not-give-microphone-permission**: The user didn't grant the necessary microphone access for the call.
 - **phone-call-provider-closed-websocket**: The connection with the call provider was unexpectedly closed.
 - **twilio-failed-to-connect-call**: The Twilio service, responsible for managing calls, failed to establish a connection.