USSD: FAQ

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.

 

To set it up you first need to configure the following on the EMnify User Interface (EUI):

• USSD service is enabled by default on the Service Profile, assigned to your endpoints, for which you desire to establish an USSD dialog
• An API Callback URL to establish the connection to your server needs to be set in the Service Profile configuration (this is where any USSD messages sent from the device will be forwarded to by EMnify's USSD Gateway
  • You can set the API URL on the "SMS" tab (within the Service Profile configuration) - select "RestAPI" on the drop-down menu for “Interface”
  • Select the “configuration icon” next to “RestAPI”, input a purpose (name of your choosing) and the URL
  • Note that the option "secret" will not be taken into account for USSD. It will only be taken into account for SMS MO.

Some USSD specs:

• Message maximum size is 160 bytes:
  • 182 characters with GSM 7bit encoding
  • 80 characters with UCS2 encoding
• USSD codes in the form of *xxx#
• The range 100-109 is preconfigured by default, so your endpoint can address different applications on your server