Business phones are usually very busy and the chances the very high that when one of your business phone number is busy on one call, more callers might be trying to reach you. With the traditional business phones, other calls will hear an engage tone or announcement that their call cannot be reached now. Your business phone will show then in missed calls unless you subscribe for an additional alert service. And in this manner, you might be missing on calls that can be very valuable for your business. But that is the case without call waiting.