Bits

8

7

6

5

4

3

2

1

Octets

Calling party number information element identifierr

0

1

1

0

1

1

0

0

1

Length of calling party number contents

2

0/1 ext.

Type of number

Numbering plan identification

3

1 ext.

Presentation
indicator

Spare

Screening
indicator

3a*

0

0

0

0

Number digits (IA5 characters)

4*

Type of number (octet 3) (Note 1)

Bits

7 6 5

0 0 0

Unknown (Note 2)

0 0 1

International number (Note 3)

0 1 0

National number (Note 3)

0 1 1

Network specific number (Note 4)

1 0 0

Subscriber number (Note 3)

1 1 0

Abbreviated number (Note 5)

1 1 1

Reserved for extension

All other values are reserved.

Note 1 - For the definition of international, national and subscriber number, (see Recommendation I.330 [18]).

Note 2 - The type of number "unknown" is used when the user or the network has no knowledge of the type of number, e.g. international number, national number, etc. In this case the number digits field is organized according to the network dialling plan; e.g. prefix or escape digits might be present.

Note 3 - Prefix or escape digits shall not be included.

Note 4 - The type of number "network specific number" is used to indicate administration/service number specific to the serving network, e.g. used to access an operator.

Note 5 - The support of this code is network dependent. The number provided in this information element presents a shorthand representation of the complete number in the specified numbering plan as supported by the network.

Numbering plan identification (octet 3)

Numbering plan (applies for type of number = 000, 001, 010 and 100)

Bits

4 3 2 1

0 0 0 0

Unknown (Note 6)

0 0 0 1

ISDN/telephony numbering plan (Recommendation E.164 [19])

0 0 1 1

Data numbering plan (Recommendation X.121 [21])

0 1 0 0

Telex numbering plan (Recommendation F.69 [22])

1 0 0 0

National standard numbering plan

1 0 0 1

Private numbering plan

1 1 1 1

Reserved for extension

All other values are reserved.

Note 6 - The numbering plan "unknown" is used when the user or network has no knowledge of the numbering plan. In this case the number digits field is organized according to the network dialling plan. e.g. prefix or escape digits might be present.

Presentation indicator (octet 3a)

Bits

7 6

Meaning

0 0

Presentation allowed

0 1

Presentation restricted

1 0

Number not available due to interworking

1 1

Reserved

Note 7 - The meaning and the use of this field is defined in 3/Q.951 and 4/Q.951.

Screening indicator (octet 3a)

Bits

2 1

Meaning

0 0

User-provided, not screened

0 1

User-provided, verified and passed

1 0

User-provided, verified and failed

1 1

Network provided

Note 8 - The meaning and the use of this field is defined in 3/Q.951 and 4/Q.951.

Number digits (octets 4, etc.)

This field is coded with IA5 characters, according to the formats specified in the appropriate numbering/dialling plan.