A2P SMS has long since been the mainstay of Enterprise communication. More recently sharp operators have moved in to exploit low-cost fraudulent routing via grey routes. As a result, mobile operators have been missing out on large chunks of revenue. According to analyst firm, Mobilesquared, in 2017 operators lost out on message termination revenue to the tune of $7.7 bn. However, the steady introduction of SS7 firewalls is changing that and by 2022 lost messaging revenue will be almost halved to $3.9 bn.