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The Significant Digits feature instructs CUCM to analyze the configured number of leastsignificant
digits of the called number for incoming calls received by a gateway or trunk.
Setting the Significant Digits to 5 on a PSTN gateway instructs CUCM to ignore all but the
last five digits of the called number for routing incoming PSTN calls. This is the easiest
approach to convert incoming PSTN called numbers to an internal extension, but it affects
all calls received from that gateway. If there are variable-length extension numbers on the
internal network, using significant digits is not the recommended approach for changing
PSTN received digits to an internal dial plan.
In Figure 12-14, the PSTN gateway receives an incoming call with the destination number
of 408 555-1010 through a gateway. If Significant Digits = 4 is configured under the
gateway configuration in CUCM, CUCM strips off all digits except the last four (1010),
looks up this number (1010) in its call-routing table, and forwards the call to the IP phone
configured with that DN.
Figure 12-14 Significant Digits Example
You can configure significant digits in the gateway or trunk configurations under the
Incoming Calls section. This parameter affects all calls received by the gateway or trunk.
NOTE In contrast to using translation patterns to map E.164 numbers to internal DNs
on incoming PSTN calls, this solution performs only one call-routing table lookup. The
Significant Digits feature is a more processor-friendly alternative than translation
patterns, but this approach will not allow the same flexibility as translation patterns.
1010