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538 TRANSACTIONS IN INTELLIGENT NETWORKSPar.12 SecondAlternateCarrier. This parameter specifies the third-choicelong-distance carrier for the call. The contents field is coded as in Par.10.Par.13 CalledPartylD. This represents the number of the called party and indicateswhether the calling party has requested operator assistance for the call. Thecontents field has the AINDigits format.Nature of Number (NN)Bits 7–5000 No assistance requested111 Assistance requestedBits 4–10001 Subscriber number0011 National number0111 International numberNumbering Plan (NP). This can be public or private.Par.14 FeatureCode (VerticalServiceCode). This is a code, dialed by a callerwho is using the public numbering plan, to request an AIN service.The contents field is in the AINDigits format. The NN and NP fields are set to“not applicable” (all zeros).The code is usually an (asterisk), followed by up to four digits.Par.15 AccessCode. This parameter is a code, dialed by a caller who is using acustomized dialing plan, to request an AIN service. The contents field is as describedfor Par.14.Par.16 CollectedAddressInfo. This parameter contains address informationcollected from the calling party. It has the same format and coding as Par.13(CalledPartyID).Par.17 CollectedDigits. This parameter holds the digits collected from the user,which may be a called party number or a number with a different meaning (e.g.,authorization code, personal identification code). The contents field has the AIN-Digits format.The NN and NP fields are set to “unknown” (000 0000 and 000).Par.18 CallingPartyBGID. This parameter is included in queries, if the callingline is a member of a business group. It identifies the group and also indicateswhether the line is restricted from making or receiving certain calls. The contentsand coding have been carried over from U.S. ISUP signaling—see Section 11.9.2.