The Grandstream GAC2500 is a powerful and versatile conference phone that is designed for businesses of all sizes. The phone offers a combination of HD audio, multi-line support, advanced features, and compatibility with various applications, making it an ideal solution for businesses that need a reliable and effective way to communicate with each other. Android-based system: With Android 4.4 as its operating system, the GAC2500 gives you access to the Google Play Store, allowing you to download and install various applications like Skype, Google Hangouts, and more for seamless conferencing and communication.