Enhanced 9-1-1 Support For Lync Server 2010; About E9-1-1 Services - AudioCodes Mediant 1000B User Manual

User's Manual

26.11.4 Enhanced 9-1-1 Support for Lync Server 2010

The Enhanced 9-1-1 (E9-1-1) service is becoming the mandatory emergency service
required in many countries around the world. The E9-1-1 service, based on its predecessor
911, enables emergency operators to pinpoint the location (granular location) of callers
who dial the 9-1-1 emergency telephone number.
Today, most enterprises implement an IP-based infrastructure providing a VoIP network
with fixed and nomadic users, allowing connectivity anywhere with any device. This,
together with an often deployed multi-line telephone system (MLTS) poses a challenge for
E9-1-1 due to the difficulty in accurately locating the E9-1-1 caller.
This section describes the E9-1-1 solution provided by Microsoft Lync Server 2010
(hereafter referred to as Lync Server 2010), and the deployed AudioCodes ELIN Gateway
which provides the ISDN (or CAMA) connectivity to the PSTN-based E9-1-1 emergency
providers. This section also describes the configuration of AudioCodes ELIN Gateway for
interoperating between the Lync Server 2010 environment and the E9-1-1 emergency
provider.
26.11.4.1

About E9-1-1 Services

E9-1-1 is a national emergency service for many countries, enabling E9-1-1 operators to
automatically identify the geographical location and phone number of a 911 caller. In E9-1-
1, the 911 caller is routed to the nearest E9-1-1 operator, termed public safety answering
point (PSAP) based on the location of the caller. Automatic identification of the caller's
location and phone number reduces the time spent on requesting this information from the
911 caller. Therefore, the E9-1-1 service enables the PSAP to quickly dispatch the relevant
emergency services (for example, fire department or police) to the caller's location. Even if
the call prematurely disconnects, the operator has sufficient information to call back the
911 caller.
The figure below illustrates the routing of an E9-1-1 call to the PSAP:
Figure 26-5: Call Flow of E9-1-1 to PSTN-Based Emergency Services Provider
1. The VoIP user dials 9-1-1.
2. The call is eventually sent to the PSTN through a PSTN Gateway.
3. The PSTN identifies the call is an emergency call and sends it to an E9-1-1 Selective
Router in the Emergency Services provider's network.
Version 6.8
26. Configuring Supplementary Services
435 Mediant 1000B Gateway & SBC