Comparing PS-ALI and VPC Solutions for Enterprise E911

Enterprises looking to enable their IP-PBX systems with Enhanced 
911 (E911) capabilities often purchase PS-ALI (Private Switch 
Automatic Location Identification) accounts that require them to 
perform extensive integration with the local carrier. However, the 
centralized nature of IP telephony and its ability to support remote 
workers compromise the effectiveness of PS-ALI. As an 
alternative, VPC (VoIP Positioning Center) solutions have emerged 
that successfully support advanced IP capabilities without the 
integration and management tasks associated with PS-ALI. This 
white paper compares PS-ALI and VPC solutions to help enterprises 
determine the E911 service that best suits their needs.