High Availability Systems Co., Ltd (HAS) was established in 1985 as Nihon Tandem System and was renamed as High Availability Systems in 2004.

As a System Integrator, HAS focuses on direct business to enterprise customers. Under its consulting and business solutions arms, it provides sales of IT products, Telecom solutions and maintenance.

HAS also involves in software and application development as well as hardware rental services.

Products
   Fax Boards
   HMP and XMS
   Service and Support
   Signaling Products