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Extension is not valid

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Leah

Leah

Programmer
Apr 8, 2017
15
0
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US
On Mitel 3300 Controller, I set up the MLAA. When a caller calls from outside and press extension number, the caller gets the error message "Extension is not valid". I figured it out. When the extension has a voice mailbox, the call is transferred, no voice mailbox extension is not able to connect. How to solve this problem?
Thank you,
 
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