While covering all of the relevant information, aim to keep your voicemail to about 20 seconds. You definitely should not ever record a business voicemail longer than 30 seconds, and anything less than 10 seconds will typically mean that you are either speaking too quickly or aren’t providing all of the required information.
Every VirtualPBX user can access their business voicemail messages through several different methods – over the phone, over the internet, and/or an email. With email, we can simply notify you that a message exists, or we can actually send you the message itself as a .WAV file attachment to the email.

Create professional phone greetings for specific events and holidays to keep customers excited and connected with your business. Provide holiday promotions or advertisements to build customer loyalty, or simply let the caller know your business is closed in observance of a holiday.
You might also consider giving them the option to skip your voicemail message completely by pressing another key (again, check with IT). You also want to make callers aware what you will return their call, instead of telling them that you will try to return their call--and let them know when you are likely to do it, if possible. If necessary, provide additional or emergency information in your voicemail greetings. My dentist, for example, lists his cell phone number for emergencies.