 is essential for emergency services but also can be helpful when routing calls for things such as dispatching repair services. If the location of the endpoint is known, SIP trunk providers could do a better job in optimizing the call for the location. One of the important capabilities that SPs have not taken advantage of is the multi- plicity of services. Many SPs have to pay for use of a WiFi network as a service along with their SIP trunking service. A trend that should become relevant is to enable Enterprise WiFi phones from a company that has subscribed to the SIP trunking service access to the WiFi network. This allows an SP to provide a unique combina- tion of capabilities of WiFi access to the physical devices and SIP trunking as a serv- ice for this device. In summary, the capabilities of enterprise WiFi devices will continue to get better by tak- ing advantage of the technology that is constantly improving in cellular phones. However, there will always remain a distinct difference in WiFi phones and cellular phones. SIP trunking providers can take advantage of these differences by offering unique services, such as enterprise WiFi phone roaming, location-based services, and bandwidth adapta- tion to effectively take advantage of the unique characteristics of WiFi phones in a SIP trunking environment. Cellular Phone Trends Within Enterprises and Their Effects on SIP Trunking Cellular phones for most business users have become ubiquitous. In the enterprise, they have also become a major factor with more than 60 percent of business users having a desk or hard phone and a cellular phone. This has resulted in an explosion of overlapping features and billing of enterprise locations for both a desk and cellular phone. With the increasing mobility of today's workers, the number of minutes on the cellular network is also growing faster than the number of minutes on the enterprise TDM network. This creates a dilemma for enterprise telecommunications managers. To better service employees in the enterprise, they nee