SIP (Session Initiation Protocol) allows users to see who they are communicating with for conferences, sales calls, interviews, and other situations where seeing the person is important. It can adapt to different client systems and interact well with other protocols. SIP provides the ability for users in different locations to see and interact with each other and devices without being physically present. This has enabled common video calls. SIP systems are widely used by companies for employee communication and by military and medical organizations for sharing vital visual information remotely. Using SIP trunks provides substantial cost savings over traditional phone systems and increased communication benefits.