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3CX Phone System for Windows System for Windows
Page 40
Calls from extension(s) – Select this option to define particular extensions or extension
ranges for which this rule applies. Specify one or more extensions separated by
commas, or specify a range using a -, for example 100-120
Calls with a Number length of – Select this option to apply the rule to numbers with a
particular digit length, for example 8 digits. This way you can capture calls to local
area numbers or national numbers without requiring a prefix.
3. Now specify how the outbound calls should be made.
In the ‘Make outbound calls on’
section, select up to 3 routes for the call. Each defined gateway or provider will be listed
as a possible route. If the first route is not available or busy, 3CX Phone System will
automatically try the second route.
4. You can transform a number that has been ‘caught’ by the outbound rule before it is
routed to the selected gateway or provider using the ‘Strip digits’ and ‘Prepend’ fields:
Strip digits – allows you to remove 1 or more of the digits. Use this to remove the
prefix before it is dialled on the gateway or provider. In the example above, you
would specify to remove 1 digit, in order to remove the prefix ‘0’ before it is dialled.
Prepend – allows you to add one or more digits if needed by the provider or
gateway.
You can set these options per route, since a VOIP gateway connected to the local
PSTN might require a different logic than if the call is routed via a VOIP provider.
Manage outbound call rules
To manage outbound rules, click on Outbound Rules > Manage in the 3CX Management
console. This brings up the list of the rules and shows you at a glance how outbound calls
are routed. You can configure the priority of a rule by moving the rules up or down in the
list.