SMS Aggregator is a mobile telecom company which has numerous agreements with mobile operators to send and receive data in and out of the operator’s SMSC.
SMS Aggregator acts as a negotiator between companies i.e. content and brand owners who want to deal with end users (through their mobile phones; i.e. via SMS) and mobile operators. SMS messages are transfered to the operator’s SMSC, but not directly to the subscriber’s handset as aggregators lacks direct access into the SS7 protocol and the SMSC takes care of further handling of the message through the SS7 network.