4.2.21 EF_ECC (Emergency Call Codes)

31.1023GPPCharacteristics of the Universal Subscriber Identity Module (USIM) applicationRelease 17TS

This EF contains emergency call codes.

Identifier: ‘6FB7’		Structure: linear fixed			Mandatory
SFI: ’01’
Record size: X+4 bytes			Update activity: low
Access Conditions: READ ALW UPDATE ADM DEACTIVATE ADM ACTIVATE ADM
Bytes	Description			M/O		Length
1 to 3	Emergency Call Code			M		3 bytes
4 to X+3	Emergency Call Code Alpha Identifier			O		X bytes
X+4	Emergency Service Category			M		1 byte

‑ Emergency Call Code.

Contents:

– Emergency Call Code.

Coding:

– the emergency call code is of a variable length with a maximum length of 6 digits. Each emergency call code is coded on three bytes, with each digit within the code being coded on four bits as shown below. If a code of less than 6 digits is chosen, then the unused nibbles shall be set to ‘F’.

Byte 1:

b8

b7

b6

b5

b4

b3

b2

b1

LSB of Digit 1

::

::

MSB of Digit 1

LSB of Digit 2

:

:

MSB of Digit 2

Byte 2:

b8

b7

b6

b5

b4

b3

b2

b1

LSB of Digit 3

:

:

MSB of Digit 3

LSB of Digit 4

:

:

MSB of Digit 4

Byte 3:

b8

b7

b6

b5

b4

b3

b2

b1

LSB of Digit 5

:

:

MSB of Digit 5

LSB of Digit 6

:

:

MSB of Digit 6

– Emergency Call Code Alpha Identifier.

Contents:
Information about the dialled emergency number to be displayed to the user.

Coding:
this alpha‑tagging shall use
either:

– the SMS default 7‑bit coded alphabet as defined in TS 23.038 [5] with bit 8 set to 0. The alpha identifier shall be left justified. Unused bytes shall be set to ‘FF’.

Or

– one of the UCS2 coded options as defined in the annex of TS 31.101 [11].

– Emergency Service Category.

Contents:
Information to be sent to the network indicating the category of the emergency call.

Coding:
Coding according to TS 24.008 [9].