Whether it’s an out-of-stock product, a canceled event, or social media snafu, there are times when your business may see an influx of frustrated callers. While it is important to address their concerns head-on, you may not be able to answer each call as it’s received. Make sure you use best practices for dealing with angry customers, and that your voicemail greeting sets the appropriate tone. Avoid defensive language, validate their concerns, and keep them informed as to how you are handling the situation.
Doing this gives your prospects the assurity that you will follow up with them which makes them drop in their contact details for you to reach out to them.

Voice mail allows business professionals access to messages -- even when they're away from the office. A call to any business or home used to mean one of three things -- an answer, a busy signal or endless, unanswered ringing. Increasingly, it now means an encounter with voice mail.
It’s a good practice for each of your team members to have their own personal business phone numbers. There are many reasons why they shouldn’t use their personal cell phone number for business, so you’ll want to give them their own phone number through your VoIP provider or phone system.