Keep your personal voicemail greeting as short and to the point as possible, even if you are injecting a little creativity into it. This is especially important if you expect to receive a lot of long-distance phone calls or calls from those on different cell phone networks, as many phone companies charge by the minute. Think about your personal preferences when you reach someone’s voicemail, and tailor your own greeting towards that.
In the Destination field, select IVR Menus, then New IVR. Provide a name for your IVR (eg. "Incoming"), then enable the Allow Extension Dialling option if callers should have the option of directly dialing a staff member's extension number. From the Greeting field, select an existing sound file on the PBX (if applicable), New Sound (Upload) to upload a greeting file from your computer, or New Sound (Record) to record an announcement from an existing extension. As this field specifies the audio file with the options (eg. Press 1 for sales), we do not recommend routing to this IVR without an announcement in place (Announcement: Disabled).

Cell phone voicemail greetings are generally more personal and casual than office phones. Consider a greeting like “Hello, you’ve reached [your name]’s cell phone. I can’t take your call at the moment, but if you leave a brief message, I’ll get back to you as quickly as possible.”
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