USSD Call flow:
USSD is a service provide by the mobile operators for access real time (transaction based) data/menu transfer from mobile device to operators backed core network. USSD can be run on basic phone, no internet required. So this is useful for the are where no internet access. E,g rular areas , people cannot effort smart phones.
There are two kind of USSD Call flow.
- Mobile Initiated
- Network Initiated.
Mobile Initiated USSD Call Flow:
- Mobile subscriber dials a string (*123#).
- The ProcessUSSDRequest reaches to the HLR of sim card provider. The HLR number (global title) is received at the time of location update.
- HLR sends and API towards CRM for a string whit source MSISDN.
- CRM response with a menu to HLR.
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