Etherstack plc, a wireless technology company, engages in the development, manufacturing, licensing, and sale of mission critical radio technologies to equipment manufacturers and network operators in the United Kingdom, United States, Japan, and Australia. The company's technology enables push-to-talk (PTT) communications; and advanced digital land mobile radio (LMR), and cellular and satellite networks. It offers a range of cryptographic solutions, including P25 security suite, which unites AES/DES P25 encryption engine with P25 key fill device (KFD) support for complete P25 subscriber encryption; P25 key management facility; P25 security dongles; and FIPS 140-2 cryptographic module, a single-board security device that implements APCO P25 encryption, decryption, and key management and storage services in conformance with FIPS140-2 standards. It also designs, develops, supplies, and licenses wireless air interface protocol stacks for third-party defence and critical communications radio manufacturers. In addition, the company offers LTE interworking function for LMR; LMR protocol stacks; and LMR voice and data systems. Further, it provides tactical and satellite solutions, such as P25 tactical repeater, which is a compact, battery-powered, and rapidly deployable analog for stand-alone or network augmentation use; and IVX, a small form factor push-to-talk over IP radio for encrypted voice and data communications. The company serves carrier, defence, public safety, utilities, and resource sectors. The company was formerly known as MM&S (5698) plc and changed its name to Etherstack plc in May 2012. Etherstack plc was founded in 2002 and is based in Chippendale, Australia.