Specifications

ShoreTel 9.1 Page 39
SIP Header Enhancement –
Integration with 911 Enable
Introduction
ShoreTel 9.1 modifies the SIP Header structure in packets handled by the ShoreTel system.
The MAC address is added to the From Header.
This change accommodates a third party solution for providing emergency services to
devices in an IP network without requiring PSTN access.
Background
The emergence of centralized IP-PBX deployments and greater employee mobility requires
a reliable 911 option. The e911 feature available in this release now offers improved
customer support. Device deployment options, including desktop office phones and remote
teleworker phones, along with mobile feature options, including Anyphone and Find Me,
increase the difficulty of physically locating an IP Phone that originates an emergency call.
Terms
New Terms
911 Enable 911 Enable is a third party vendor that markets a reliable method of routing
calls from IP network devices to emergency service providers.
Emergency Gateway (EGW) An Emergency Gateway 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) Emergency Routing Service is a service provided by 911
Enable that routes location information received by an EGW to the appropriate Public
Safety Answering Point.
Established Concepts
Call Manager (switch) Call Manager is a ShoreGear module that handles MGCP
information from the IP phones to which the switch is assigned. This hardware module
is not directly related to the Call Manager client application.
Media Access Control (MAC) Address The MAC Address is a 48-bit number assigned to a
hardware device. The MAC address is written into the device hardware code when
manufactured and accessed by programs when configuring or locating the device. The
MAC address assigned to a device is unique from all other assigned MAC addresses.
PSAP A Public Safety Answering Point is a call center responsible for answering calls to an
emergency telephone number for police, firefighting, and ambulance services.
SIP Session Initiation Protocol is a signalling protocol that is typically used for setting up
and tearing down multimedia communication sessions, including voice and video calls.
SIP also supports video conferencing, streaming multimedia distribution, instant
messaging, and presence information.