AT&T has announced a new addition to its small lineup of business-focused rugged PTT phones in the Sonim XP5 PTT feature phone. The phone features an IP68 rating for protection against liquid and dust, and a mil-spec 810G rating for protection against drops and other physical shock. The Sonim XP5 also features Wi-Fi and 4G LTE support while being fully compatible with AT&T’s Enhanced PTT service. Pricing and availability will be announced in the future.