USSD Gateway is based upon the ability of the delivery agent or the source to send and receive USSD messages. An USSD is a session-based protocol. USSD messages travel over GSM signaling channels and are used to query information and trigger services. Unlike similar services(SMS and MMS), which are store and forward based, USSD establishes a real time session between mobile handset and application handling the service
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“Antithesis is the narrow gateway through which error most prefers to worm its way towards truth.”
—Friedrich Nietzsche (1844–1900)