Avaya helps to tie the corporate world together. The company's communication equipment and software integrate voice and data services for customers including large corporations, government agencies, and small businesses. Its office phone systems incorporate Internet protocol (IP) and Session Initiation protocol (SIP) telephony, messaging, Web access, and interactive voice response. Avaya also offers a wide array of consulting, integration, and other managed IT services. The company sells directly and through distributors, resellers, systems integrators, and telecommunications service providers; more than three-quarters of its sales are made indirectly. In 2017 the company filed for Chapter 11 bankruptcy to deal with a heavy debt load.