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554 TRANSACTIONS IN INTELLIGENT NETWORKSIn AIN, the service can be implemented without a physical line. B’s line is attachedto his local exchange, where its directory number is DN 1 . The number advertised by Bis DN 2 , which is covered by a Chicago SSP, where a TAT trigger is assigned to thatnumber.When a client dials DN 2 , the SSP encounters the trigger and sends a Termination_Attempt message, with DN 2 in CalledPartyID (Par.13). SCP returns a Forward_Callmessage, with DN 1 , in CalledPartyID, and SSP forwards the call to B’s localexchange.Call Distribution. Suppose that business customer B employs n “work at home”agents [20]. The directory numbers of the agents, whose lines may be attached todifferent SSPs, are DN 1 ,DN 2 , ...,DN n .The advertised directory number of B’s business is DN A , a number covered bySSP A , but which does not represent an actual line. In SSP A , a TAT trigger isassigned to DN A , and SCP has a list of DNs associated with DN A .AcalltoDN A encounters the TAT trigger and causes SSP A to send a Termination_Attempt message, in which CalledPartyID holds DN A .The SCP then checks idle/busy status of the agents on the list, by executing statusnotification transactions (Section 17.6.4) with the SSPs to which the agents areattached, and allocates the call to an idle agent. Suppose that the previous call hasbeen allocated to DN 5 . SCP then starts checking the status of DN 6 and continuesuntil it has found an idle DN or has come full circle without finding an idle DN.In the first case, it sends an Analyze_Route, or a Forward_Call, message to SSP A ,depending on whether the line identified by DN is attached to SSP A . If all DNsare busy, SCP sends a Disconnect, or Send_To_Resource_Final, message.17.8 ACRONYMSACAC(3)AINAMAANRASEBCDBCMCCISCDPDISCDNDTMFFCDFWCGTAuthorization codeArea code (three digits)Advanced intelligent networkAutomatic message accountingAnalyze Route messageApplication service elementBinary coded decimalBasic call modelCommon-Channel Interoffice SignalingCustomized dialing plan triggerDisconnect messageDirectory numberDual tone multifrequencyFeature code dialing triggerForward Call messageGlobal title

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