Extension not found error on calling an extension

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Extension not found error on calling an extension
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ANSWER:

Your configuration files look fine. And pardon if this is stupid question, but – have you reloaded the dialplan? And what result does it have to add

exten=>s,1,Answer()
exten=>s,n,Playback(beep)
exten=>s,n,Hangup() 

this to to your polycom context?

by jbreicis from http://serverfault.com/questions/382266