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The 'Extension Length' used to determine how many of the DID digits (starting from the end) are to be used
as the Voicemail box no.
No Intro message
On entry to a voicemail box a standard intro is normally played asking the user to leave a message then press # or just hangup to end the message.
If you want to change this message the use this option to suppress the standard intro message and add a Playback step before this step to play your own custom message.
The most common usage is when you don't want the user to hangup after leaving the message.
Example
A staff member has a Direct In Dial (DID) number of 03 8320 8111, their extension no. is 111 and their voicemail box
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