Locating IP calls is becoming an increasingly important subject
- More and more persons and companies are equiped with VoIP access
- Service provider as us may be interested or required to provide video call access to emergency services.
- Our participation to the REACH 112 European projet put this kind of discussion in front of the issues to address in order to provide good emergency services for deaf population.
The transport of location information is already well described and standardized by IETF and the ECRIT commitee and is using XML format (how verbose!) called LO-PIDF. Its handling in SIP protocol is decribed in the following draft: location conveyance.
Finally, telecom authorities are starting to take noice and OfCom, the British regulator has produced a fairly comprehensive report about this. Good reading.