Most voice mail users have a desk phone line, which rolls calls to a voice mailbox. Customers with virtual telephone numbers (TNs) do not have a physical desk phone for this number. If you use voice mail with a Cox virtual TN, refer to the tips listed below. If you have a virtual TN, the related voice mailbox should be pre-set by Cox voice mail teams. If you cannot access the box from a valid access number, contact a Cox representative to make sure that the mailbox is initialized. When you log in to the mailbox, you need to update the PIN, record a new greeting, and record your name. Use voice mail and features as necessary. Paging Notification
Once you have your message, you need to actually record it. The exact process varies depending on whether you’re using a cell phone or office phone, but here’s the basic process: Press the voicemail button, or press and hold 1 on most cell phones. Enter your password. Record your message. Listen to the message you just recorded. Follow the prompts to save your message. Following Up on Voicemail Messages

I have a confession to make: I haven't recorded a new voicemail greeting in nearly a decade. Since then, I've (hopefully) become more articulate, poised, and self-assured. But hear my voicemail recording, and you'd think I was still new to the work world, a little unsure of myself — and probably not an authority.
A good business voicemail greeting creates a favorable impression on the customer, whether it’s their first or fifteenth time calling your business. What to say in a business voicemail greeting At the very minimum, you want to say the name of the person or department, and company name so the caller knows they have reached the right place .