National Language Shift

Along with the standard features of SMPP 3.4, we also provide the National Language Shift functionality which enables you to use special characters from language-specific character sets. National Language Shift Tables are character sets that are customized for specific characters according to the language, the list of supported languages can be found in the table below.

Using the extended character sets, you can send messages with language-specific special characters at the same price as standard GSM-7 messages. As an example, Turkish locking shift characters like ğ, Ğ, are then at the cost of a single GSM-7 character⁠—there is no need for Unicode messages that would limit the total message amount down to 70 characters. Using the UDH we only reduce the message to 155 characters (since UDH takes up additional space in the message payload).

When a single shift of a particular character set is used, each extended letter will take up double space because an invisible space character has to be used to access the shift table.

For example, when using Spanish NLI Ú is only accessible in the single shift character set extension, which requires the use of an escape character. With each new single shift character introduced, the message length reduces by 1 respectively. This means in case there are 3 single shift characters, the default limit of 155 characters per NLI message is reduced to 152.

Example:

1B55 (1B is the escape character, 55 is Ú that is used from the extended character set)

Language selection is possible by using language identifiers within the UDH part of the message payload. The IEI (Information-Element-Identifier) specifies whether the single or locking shift will be used.

  • ESM class parameter, in this case, must be defined to 64.
  • Data coding values that can be used are 0 or 1.

Locking Shift Example UDH

UDH Length

IEI (Information Element Identifier)

IE Length

Selected shift

03

25

01

01

Remaining UDH length in bytes

National Language Locking Shift

 

Locking Shift - Turkish

Single Shift Example UDH

UDH Length

IEI (Information Element Identifier)

IE Length

Selected shift

03

24

01

02

Remaining UDH length in bytes

National Language Single Shift

 

Single Shift - Spanish

UDH Identifier Reference

Below is a UDH reference for each language and here’s a detailed character set reference for GSM 7.

Language

Single Shift

Locking Shift

UDH Identifier

Reserved

Basic

Basic

0x00

Turkish

Turkish

Turkish

0x01

Spanish

Basic

Spanish

0x02

Portuguese

Portuguese

Portuguese

0x03

Bengali

Bengali

Bengali

0x04

Gujarati

Gujarati

Gujarati

0x05

Hindi

Hindi

Hindi

0x06

Kannada

Kannada

Kannada

0x07

Malayalam

Malayalam

Malayalam

0x08

Oriya

Oriya

Oriya

0x09

Punjabi

Punjabi

Punjabi

0x0A

Tamil

Tamil

Tamil

0x0B

Telugu

Telugu

Telugu

0x0C

Urdu

Urdu

Urdu

0x0D