CALL ROUTING AND EMERGENCY CALL CENTER CAPABILITY

Within the limitations of current positioning technology, emergency calls should be routed to the emergency call center that has jurisdiction over the area that the call is coming from and that is best able to process the call.

For the current phase of emergency call support as represented in this document, it is assumed that emergency call centers support only voice calling capability, i.e., they can receive circuit switched voice calls or packet switched VoIP calls. In the future, IP-capable emergency call centers may come into being which will have the capability to send and receive other types of media (e.g., pictures with escape routes, video). This may be the subject of a future revision of this and other associated documents.

Although the subject of the current set of requirements supports VoIP emergency calls to emergency call centers, this should not preclude forward compatibility to support other media and multimedia emergency calls.

APPLICABLE RADIO INTERFACES

Emergency call access via the following radio interfaces is supported:

•HRPD [2]

•cdma2000-1X [3]

•WLAN [6]

Definition of the air interface for WLAN is out of scope for 3GPP2.

NETWORK AUTHORIZATION

The network is required to support emergency calls from both Authorized and Unauthorized UEs, subject to local regulation.

MMD FACILITIES

MMD core network facilities (see [4] and [7]) can be reused and/or enhanced for VoIP emergency call support.

FUTURE SCOPE EXTENSIONS

Considerations for future extension of this document include:

•Support for additional media during an emergency call (e.g., text messaging, sending and receiving pictures and video signals).

• Support for improved voice quality enabled by means of a wideband codec over VoIP.