Specifications

SIP Header Enhancement – Integration with 911 Enable ShoreWare Server Release Notes
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Description
911 Enable is a third party vendor that markets a reliable method of routing calls from IP
network devices to emergency service providers. The 911 solution consists of two
components:
• An Emergency Gateway (EGW) is a hardware device manufactured by 911 Enable that
tracks IP device movement and handles emergency calls between a corporate IP
network and the 911 Enable Emergency Routing Service through SIP trunks.
• Emergency Routing Service (ERS) is a service provided by 911 Enable that routes
location information received by an EGW and to the appropriate Public Safety
Answering Point.
The Emergency Gateway receives 911 calls from the ShoreTel network, then communicates
with the ERS to determine the appropriate PSAP for the emergency call. ERS maintains a
database that associates IP device MAC addresses with the physical location of the device.
To support the 911 Enable solution, the structure of ShoreTel SIP packet is modified to
include the MAC Address of the originating device in the From Header. The following is an
example of a From header containing the MAC address of a device:
From: "2181"<sip:2181@158.101.74.202>; tag=c7aaad0801d6-00e0bb18b520
A new SIP trunk profile parameter – SendMACIn911Call Setup – is added to the default
SIP trunk profile. The default value of this parameter is enabled.
Figure 14 Integration 911 Enable Emergency Call Routing
Call Manager
Switch
SIP Trunk
Switch
T1 Switch
E911 Enable Integration
Emergency
Gateway
(EGW)
SIParator
SIP Trunk:
911 Enable
Service
SIP Trunk:
ITSP
T1 Trunk:
PSTN