User's Manual 292 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
15.7.4.4 Configuring SBC IP-to-IP Routing Rule for E9-1-1
To route incoming E9-1-1 calls to the emergency service provider's PSAP server, you need
to configure routing rules in the IP-to-IP Routing table for routing between the emergency
callers' IP Group and the PSAP server's IP Group. The only special configuration is to
define the emergency number (e.g., 911) in the 'Destination Username Prefix' parameter of
the IP Group belonging to the E9-1-1 callers. The following example shows IP-to-IP routing
rules for E9-1-1 in a Skype for Business environment:
Figure 15-56: Example of IP-to-IP Routing Rules for Skype for Business E9-1-1
15.7.4.5 Configuring Location-Based Emergency Routing
The device identifies the geographical location of emergency callers by their ELIN
numbers, which is present in the PIDF-LO XML body of received SIP INVITE messages.
Therefore, you need to configure the device to route emergency calls to a destination (i.e.,
emergency center such as police) that is appropriate to the caller's ELIN number. As the
destination of incoming calls is the emergency number (e.g., 999), the device needs to
manipulate the destination number to a number that represents the caller's local
emergency center (e.g., +4420999 for London police).
Note: Location-
based emergency routing is applicable only to the Gateway
application.
To add manipulation rules for location-based emergency routing, you need to use the
Destination Phone Number Manipulation for IP-to-Tel Calls table. In this table, you need to
use the ELIN number (e.g., 5000) as the source prefix, with the "ELIN" string value added
in front of it (e.g., ELIN5000) which is used by the device to identify the number as an ELIN
number (and not used for any other routing processes etc.). For each corresponding ELIN
source number prefix entry, you need to configure the manipulation action required on the
destination number so that the call is routed to the appropriate destination.
Following is an example of how to configure location-based emergency routing:
Assumptions:
• Company with offices in different cities -- London and Manchester.
• Each city has its local police department.
• In an emergency, users need to dial 999.
• Company employs Microsoft Skype for Business for communication between
employers, and between employers and the external telephone network (PSTN).
In other words, all employers are seemingly (virtual) in the same location in
respect to the IP network.
• ELIN numbers are used to identify the geographical location of emergency calls
dialed by users:
♦ London ELIN is 5000.
♦ Manchester ELIN is 3000.
Configuration Objectives:
• Emergency calls received from London office users are routed by the device to
the London police department (+4420999).
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