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.
I can’t come to the phone right now because I’m down in the basement printing up a fresh new batch of 20 dollar bills. If you need any money, or if you just want to check out my handi- work, please leave your name, number, and how much cash you need after the tone. If you’re from the Department of the Treasury, please ignore this message.

If all this seems like a lot of homework, remember that it's well worth the effort. Just about anything you can picture a business needing from a phone or collaboration system can be delivered by a hosted VoIP PBX solution—and generally at a more affordable price than purchasing and maintaining your own on-premises PBX. It's just a matter of selecting the right solution for your business.
Aside from these cases, most businesses should consider using an off-site or "hosted" PBX. It is an option on many small business VoIP systems and offered by many ITSPs. The big benefit with a hosted PBX is it can offer more advanced phone system functions, such as auto-attendants and IVRs, without the expense of purchasing and managing an on-site hardware PBX.