Confluence has that:

https://freeswitch.org/confluence/display/FREESWITCH/mod_voicemail#mod_voicemail-vm-alternate-greet-id%28voicemail_alternate_greet_id%29

Wiki is dead. Long live the wiki.

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Bote

FreeSWITCH Docs Janitor

http://freeswitch.org/confluence

From: Andrew Cassidy
Sent: Monday, 18 January, 2016 10:06
Subject: Re: [Freeswitch-users] How to customize voicemail greeting number ?

https://wiki.freeswitch.org/wiki/Mod_voicemail#vm-alternate-greet-id_.28voicemail_alternate_greet_id.29

On 18 January 2016 at 12:48, Rutu Patel <rutu.patel@inextrix.com> wrote:

Hi All,

I am using voicemail module with odbc.

I have a DID(123456789) in freeswitch and it's routed to local extension(1000).
When the extension does not available it goes to voicemail and plays that number(1000) is not available.Is it possible to change the number in playback?
I want to play DID(123456789) is not available instead of destination number(1000).

Any suggestions will be appreciated.

--
Thanks,
Rutu Patel