Click Auto Attendant and then select the Auto Attendant to edit from the list.
For phone greetings to be successful, they need to be: Crisp. A crisp, clear voice goes a long way. The message needs to be clearer than glass. No shuffling papers or dogs barking in the background. **Professional. **Your phone greeting needs to sound like you're a real company, not a random person answering their cell phone. Thought-out.

There are a number of options for customizing your business voicemail greeting. A unique professional greeting helps your company appear personable and knowledgeable. You can organize your message to share information about your company's products, direct callers to the appropriate department, or even provide directions to your location.
11. “Hello! You’ve reached [company name] support line. We’ll be happy to help with your inquiry. In the meantime, have you checked out our [website, help forum, etc.]? It may have the answer you’re looking for. If not, leave your name, number and reason for your call. We’ll reach out to you within the day. Thanks for calling [company name].” Sometimes, a caller likes to find the answer to their own questions. Let them discover by directing them to your website or help forum if you have one.