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The external phone number mask is a DN configuration attribute. The external phone
number mask of the first DN of the phone is also used for the following functions:
■ Change the display of the main phone number at the top of the LCD screen. A DN
of 15001 with an external phone number mask of 21255XXXXX would result in a
displayed phone number of 212 551-5001. Any user on the phone can instantly identify
the PSTN direct inward-dialing number by viewing the LCD of the phone.
■ Automated alternate routing (AAR) technology uses the external phone number mask
to manipulate digits for PSTN outbound dialing when bandwidth is not available for a
guaranteed-quality call over the WAN. The AAR call will be rerouted out the PSTN
using the full phone number of the destination as determined by the application of the
external phone number mask.
■ Change the display of the caller ID for all calls in which the call classification is offnet.
In a four-digit dial plan, the caller ID is changed to the full ten-digit PSTN direct
inward-dialing phone number.
Figure 12-4 displays the configuration of the external phone number mask at the directory
number configuration page. This page is accessed by navigating to the following:
■ Device > Phone > Find. Click a phone, and then click the DN that you want to
configure on the Directory Number Configuration page.
Figure 12-5 displays the configuration of a route pattern that will be used to route calls to
the PSTN. The Calling Party Transformations section includes a check box to use the
calling-party’s external phone number mask for the calling-party presentation on the PSTN.