Rollover Hunting is a feature that is managed by the Account Manager or Phone Manager. It allows incoming calls to your primary phone line to roll over to the next available line and, if al l lines are busy or not answered, the call can roll over to voicemail. It will hunt through all lines in the group once to find an idle line. You can configure multiple hunt groups and the number of rings before the call is routed to the next li ne. Each hunt group must have a minimum of two lines and a unique primary number. There are three hunt sequence options:
Many small businesses contact us every day, looking for advice as they search for a new phone system. Some are new businesses just getting started, while others are looking to replace an old or problematic system. The most common reasons they have are that they're: Wanting to switch to VoIP Relocating or adding new offices Unhappy with current call quality Looking for more features, such as an IVR Needing a system that's more user-friendly IVR designer in Five9 Cloud Contact Center

You can ask your admin to change the greeting language for everyone in your organization. Your admin should see this topic for instructions: Change the default language for greetings and emails.
Optimum is the first landline telephone service provider in the U.S. to launch High Definition calling. HD calling is the next generation of voice technology that gives you less background noise, sharper sound quality and increased clarity in your phone conversations. To experience HD calling, customers and call recipients must subscribe to Optimum Voice and use HD-capable handsets.