176 
Table 31 through Ta ble 36 show the ISDN number type and numbering plan identification bitmaps for 
different ISDN protocols. 
calling: Specifies calling numbers. 
called: Specifies called numbers. 
in: Specifies incoming ISDN calls. 
out: Specifies outgoing ISDN calls. 
Table 31 ISDN number type and numbering plan identification bitmap for AT&T 
Ext 
Type of 
number 
Numbering 
plan 
Information 
element 
Type of 
number 
Numbering plan 
identification 
8  7  6  5  4  3  2  1 
        0  0  0  0  Calling party number  N/A  Unknown 
        0  0  0  1  Calling party number  N/A 
ISDN/telephony 
numbering plan 
(Recommendation 
E.164) 
        0  0  1  1  Calling party number  N/A 
Data numbering plan 
(Recommendation 
X.121) 
        0  1  0  0  Calling party number  N/A 
Telex numbering plan 
(Recommendation 
F.69) 
        1  0  0  0  Calling party number  N/A 
National standard 
numbering plan 
        1  0  0  1  Calling party number  N/A  Private numbering plan 
        1  1  1  1  Calling party number  N/A  Reserved for extension 
 
Table 32 ISDN number type and numbering plan identification bitmap for ANSI, ETSI, DSS1, 
and NTT 
Ext 
Type of 
number 
Numbering 
plan 
Information 
element 
Type of 
number 
Numbering plan 
identification 
        0  0  0  0 
Calling party number 
Called party number 
N/A  Unknown 
        0  0  0  1 
Calling party number 
Called party number 
N/A 
ISDN/telephony 
numbering plan 
(Recommendation 
E.164) 
        0  0  1  1 
Calling party number 
Called party number 
N/A 
Data numbering plan 
(Recommendation 
X.121) 
        0  1  0  0 
Calling party number 
Called party number 
N/A 
Telex numbering plan 
(Recommendation 
F.69) 
        1  0  0  0 
Calling party number 
Called party number 
N/A 
National standard 
numbering plan