<xhtml:p>The invocation of handleCalledNumber requests the application to
inform the gateway how to handle the call between two addresses, the
callingParty and the calledParty. The method is invoked when the
callingParty tries to call the calledParty, but before the network
routes the call to the calledParty. For example, the calledParty
does not have to refer to a real end user, i.e., it could be a
service number. Optionally, the callers name is provided. The
application returns the action, which directs the gateway to perform
one of the following actions:</xhtml:p>
<xhtml:p>Optionally, in the action parameter, the application can also
indicate the charging information.</xhtml:p>