Emergency call handling module

Thanks to Evandro Villaron Franceschinelli and Robison Gonsalves Tesini, ee are proud to present the opensips emergency module.

To make as emergency call using a single code (e.g.: 911 in US or 112 in Europe) has been a challenge for VOIP technology. This is a problem because a crucial information is missing: the user's location and the location is essential to route the call to the closest PSAP(call center responsible for answering emergency calls).

This has been studied by many entities, such as the IETF, who created several RFC on the topic, and the American NENA (National Emergency Number Association), who devised a solution based on the concepts of the IETF. The main elements of this solution are, LIS (Location information server ,which is the node that determines the location of the VoIP terminal), ERDB (servers that determines the area's emergency closest PSAP due this location ), VPC (servers that manage the location and routing information associated with a call) and, most importantly, the SIP PROXY that can make routing the call according to the data sent by these servers.

The OpenSIPS can be an element in this architecture acting as a SIP proxy, but need to meet the requirements of this solution. To provide this we have developed the Emergency Module, which basically makes the interface with the servers mentioned and adds the new SIP extensions that the IETF has created for this purpose. Including only two commands and some parameters in your configuration file, we enable OpenSIPS to be an important component in the solution of this problem, with great potential to meet American market or other countries that could adopt a similar architecture.

See the great tutorial on how to use this module:
http://www.opensips.org/Documentation/Tutorials-Emergency-2-1