Conformance with the IMS emergency services protocol is set to become an important requirement for handsets running on LTE and LTE-Advanced cellular networks in the US and elsewhere.
Voice calls on these IP-based networks are normally routed via an IMS architecture as a Voice-over-LTE (VoLTE) service. As IMS-based voice service begins to gain more widespread adoption, it has become an essential requirement of public safety that IMS technology should reliably support calls to emergency services such as the police and ambulance services, as 2G and 3G network technologies already do.
Members of the public will clearly want to know that they can rely on this new technology in case of emergency calls, and will put much faith into operators and handset suppliers that sufficient testing of the emergency service calls has been made.