This setting controls the usage of the outside access digit by the dialplan
in conjunction with this interface. If no outside access digit is configured
in the dialplan, this setting has no relevance. Basically, this setting
controls whether the outside access digit is expected in the called or
calling number depending on the call direction.
If this setting is enabled, the outside access digit is expected in
the called number for calls received on this interface and in the
calling number for calls sent by this interface.
If this setting is disabled, the outside access digit is expected in
the calling number for calls received on this interface and in the
called number for calls sent by this interface.
In most cases this setting is directly related to the NT/TE mode of the
interface. If the interface is in NT mode, this setting usually needs to be
enabled. If the interface is in TE mode or an FXO board is used, the
setting usually needs to be disabled.
If the Internal Interface option is enabled, calls to the connected
network will have a calling number with an outside access digit, unless
the calling party has an internal number or the number is converted to
the number type format instead of a number with a dialing prefix.
Also, the dialplan expects that calls from the connected network have a
called number with outside access digit, unless the called party has an
internal number. This expectation can be disabled in dialplan
configuration, if necessary.
If the option is disabled, calls to the connected network will have a
called number with an outside access digit, unless the called party has
an internal number or the number is converted to the number type
format instead of a number with dialing prefix.
Also, the dialplan expects that calls from the connected network have a
calling number with outside access digit, unless the calling party has an
internal number. This expectation can be disabled in dialplan
configuration, if necessary.
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