From the Product Tools section, click OneTalk.
To navigate, mouse over each option.
Click Manage groups.
From the 'Manage Groups' tab, click Edit.
Edit the group name, time zone, extension length (2 to 6 digits) and group dialing prefix (2 to 6 digits).
Changing the extension length automatically modifies all existing group extensions to use the last number of digits of the phone number.
Dialing within the group does not use the dialing prefix, it is only used when dialing across groups.
Extensions, inclusive of Virtual On Network extensions, can’t be duplicated across groups unless you assign a group dialing prefix to those groups.