What is the onsip app? The OnSIP app is an on-the-go business phone and complete desk phone replacement. With just your laptop, you can make instant HD voice and video calls to your coworkers and other contacts.How do i answer a call on onsip? To answer the call, select the green 'Answer' button or red 'Decline' button that appears in the calling window. The OnSIP app will automatically know if the inbound call is a video or audio call, and manage it accordingly. For an inbound video call]What is onsip hosted pbx? OnSIP hosted PBX takes just minutes to set up, and you can even keep your phone number. Enjoy all the features of a traditional phone system, including conference bridges, attendant menus, ring groups & ACD queues, and BHRs.How many locations can onsip be deployed in? OnSIP can be configured in a host of ways to suit the unique needs and requirements of small and medium-sized businesses. It can also be deployed in one, or multiple locations with 5 to 50 employees and its system demands no additional equipment to install.