What is wrong with this whisper intercom IE example?

What is wrong with this whisper intercom IE example?

ephone-dn 16

 number 5001

 whisper-intercom label "Whisper"

ephone-dn 17

 number 5002

 whisper-intercom label "Whisper"

ephone-dn 18

 number 5003

 name intercom

 intercom 5002 barge-in

ephone-dn 19

 number 5004

 name intercom

 intercom 5001 barge-in

ephone 1

button 1:16 2:18

ephone 2

button 1:17 2:19

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Received on Thu Sep 17 2009 - 13:10:17 ART