514     6   

          
,  .25.     ISDN   .164.

 E.I 63   12    ,  
 ISDN   .164   55  .   ISDN
     .   
       . ,
       ISDN.  ISDN
  15    ,      
.163,     ( 1  3 ),      
.  ISDN     40  . 
       -
,      S. ,   
  ,      ,  7-095-640-
20-00,    ,   134,   
  7-095-640-20-00-134.

    .,    ISDN,    -
   ISDN. ,    .25,  
     .121,    -
    ISDN,   ,     .121,  -
   ,      ,
    .121.   ISDN   
         .25  
ISDN         .25,   -
    D    .   -
 ISO 7498.

 ISO 7498     ,  -
      .  AFI (Athority and Format
Identifier)          . -
  AFI    6     :

        -
      ,  , -
 4)    ISDN;

      4> ,   
 (       );

        ,    -
 ,     Forum.
  AFI   IDI (Initial Domain Identifier)    -
 ,       DSP (Domain
Specific Part),       ,
   IDI  .
   AFI:

          -
 X.I 21-36,      ),  37,  
    .    IDI  -
  14  ,   DSP    24 .

   ISDN      .164 - 44, 
    ,  45,     -