An extension in asterisk is a user that is able to connect and use the system to place or receive calls, use voicemail and other features of asterisk. In order to define asterisk extension we should edit users.conf (Asterisk 1.4), iax.conf and sip.conf files.
There are just few conventions:
1) the extension must be numeric es. [123]
2) the callerid must be in the format "name <extension>"
example in you SIP or IAX.conf:
[123]
host=dynamic
qualify=yes
notransfer=no
secret=xxxxxxxxxx
type=friend
auth=md5
context=your extensions context
dtmfmode=rfc2833
requirecalltoken=no ;if iax
username=123
callerid=pippo <123>
mailbox=123@your voicemail context
disallow=all
allow=gsm
deny=0.0.0.0/0.0.0.0
permit=192.168.1.0/255.255.255.0
The extensions in Voix Manager are represented by buttons.

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Extensions and groups can be ordered via drag and drop, the extensions can also be moved from one group to another via drag and drop.