A grey route is a legitimate route but where the sender keeps all the revenue and the subscriber’s operator gets none. Due to the desire for the subscriber’s operator to make some money from this message, grey routes are liable to be blocked without notice and can be filtered by operator firewalls. Grey Routes take advantage of the fact that in the early days of mobile telephony there was a rule between operators, that the sender of the message would keep all of the revenue, i.e. the receiving operator does not get paid to deliver a message to its own subscriber. In the early days this worked well, but as the volume of A2P messages grew and operators became savvy to the fact that they could make money from SMS, they began trying to monetise it by signing agreements with other operators to get them to pay for delivering a message to one of their subscribers.
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