Push-to-Talk Solution (PTT) is a new way of communicating via cellular network within or between one or several groups of users. It provides the tools to take your communications to the next level by helping to expand numbers of users, extend coverage, elevate feature/functionality, and ensure reliable fallback support reliably, easily, and as much as you need when you need. The solution also allows users to use their cellular phones in a way similar to a “walkie-talkie”.