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Parameters as in I AM

First Optional Parameter

Last Optional Parameter

Indicators

Figure 9.2-2 Initial address message with additional information (IAI). (From Rec. Q.723. Courtesy of ITU-T.)

When the IAI includes more than one optional parameter, they appear in the alphabetical order of their indicator bits.

Calling Line Identity and Original Called Address. The format of these parameters is shown in Fig. 9.2-3. ND indicates the number of digits; bits B and A indicate the nature of the address:

Bits BA Nature of Address

00 Subscriber number

10 National number

11 International number

Indicator bit C is used in the calling line identity only. It indicates whether the calling party allows the presentation of his number to the called party:

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