USSD Introduction

USSD Gateway Service

USSD stands for “Unstructured Supplementary Service Data” and allows the transport of

small data volumes over the signaling channel. It does not need an active data connection

nor does it incur SMS costs.

USSD dialogs are initiated from an endpoint by dialing a USSD code in the form of *XXX#,

for all existing EMnify customer the USSD codes 100-109 are already preconfigured and

they are ready to be used.

The maximum size of a USSD message is 160 bytes. For GSM 7 Bit encoded messages this

gives a limit of 182 characters. If you choose UCS2 encoding you will have a maximum of 80

characters available.

E.g. suitable to send data of multiple sensors or geo-location data in one USSD request.

Documentation Available:

EMnify RestAPI

EMnify USSD Integration Guide