Inter-Tel’s Communication Systems include IP phones that are supported on the Inter-Tel 5000 Network Communications Solutions and the Inter-Tel Axxess Converged Communications Platforms.
To suit your dynamic needs, most Inter-Tel IP phones are available in two modes: Inter-Tel Protocol and SIP (Session Initiation Protocol) mode. Inter-Tel Protocol provides an IP phone with access to the features and functionality of a traditional Inter-Tel phone. Implementing SIP mode allows your enterprise to access the Shared Extension feature, which allows multiple phones to use the same extension number on an Inter-Tel advanced communications system. Incoming calls to a shared extension are sent to SIP phones simultaneously; offering you dynamic mobility when you're away from your main desk. Additionally, SIP mode enables IP phones to interoperate with third-party SIP solutions.