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552 TRANSACTIONS IN INTELLIGENT NETWORKSTranslation of 800, 900, and 976 Numbers. Translation of 800 numbers intorouting numbers (unpublished 10-digit NANP numbers) has been available since1980, as an intelligent network 1 (IN/1) service [1,2]. Today, most 800-numbertranslations are still made by IN/1 databases. However, telecoms can move thesetranslations to SCPs.It is also possible to assign the translations of some 800 numbers to SCPs andleave the translations of other 800 numbers to the older databases. As anexample, the split can be based on the NXX code in the 800-NXX-XXXX number.This is done by assigning six-digit triggers to the 800-NXX codes to be translatedby SCP.Translations of 900 and 976 numbers are usually done by SCPs and require theassignment of triggers to these numbers at the SSPs.When SSP encounters one of these triggers, it sends an Info_Analyzed messagein which TriggerType (Par.6) is set to “three, six, or ten digits,” the called number isin CalledPartyID (Par.13), and the calling line is identified.Translations of 800, 900, and other numbers can be tailored to the requirementsof the individual business customers.For example, a multilocation business that has an 800, or 900, or other numbermay require that incoming calls are routed to its nearest business office. Usually,the business customer specifies individual routing numbers for calls originated bylines in particular numbering plan areas (identified by NPA), or in a particularexchange areas (identified by NPA-NXX ).In addition, the determination of routing numbers can be made to depend on thetime-of-day and day-of-week of the call.In the Analyze_Route message from SCP, the routing number is in CalledPartyID(Par.13). Since the calls involve special billing and charging, the message alsoincludes AMAAlternateBillingNumber (Par.23).Personal Numbers. A personal number is a number by which a customer can bereached, regardless of his/her present location. We assume that the numbers havethe format 500-NXX-XXXX. For this service, three-digit triggers are assigned to500 numbers at all SSPs. For each 500 customer, SCP stores a “current address”by which the customer can be reached at this time.On a call to a 500 number, SSP encounters the trigger and sends an Info_Analyzedmessage in which TriggerType (Par.6) indicates “3-digit” and CalledPartyID(Par.13) holds the 500 number. The SCP translates the number into the currentaddress, and its Analyze_Route message includes the address in CalledPartyID(Par.13).Customers with 500 numbers can update their current addresses when moving toa new location; for instance, after entering their respective homes, cars, offices, orafter arriving at their hotels.One way to update a current address is described below. The telecom establishesan “updating” number, say, 500-234-5678. To update the current address, the customercalls the updating number. SSP encounters the three-digit trigger and sends an