[ Thanks to Sanjiv
Lavangare for this link. ]
“Standard features
The following sections will break down the list of available
features by category. While the codes listed are the default
settings, they can be modified in the PBX Configuration tool using
the Feature Codes module. These features are invoked by dialing the
code from a registered SIP or IAX endpoint, or via an analog
extension plugged into an FXS port. Some of the following features
require the appropriate PBX Configuration tool module to be
installed.“Call forwarding
The call forwarding mechanism is both powerful and flexible. With
the different options, you can perform a number of different
functions or even create a basic find-me/follow-me setup when using
a feature like call forward on no answer, or send callers to your
assistant if you are on a call using call forward on busy.”