Enterprises are beginning to recognize the benefits of Voice over IP and the overall positive impact the technology can have on business communications. As organizations continue to expand mobile working, many employees are spending increasing amounts of time working entirely from wireless devices. Examine mobile VoIP applications with QoS that rivals traditional PSTN and mobile phones.  Discuss the emerging mobile VoIP trends forecasted to take place, including the long-term potential mobile VoIP technologies have to affect the basic architecture of enterprise voice systems.  In addition, explore security threats, challenges and myths that can compromise IP-based communications.