Legacy Network Gateways - Emergency Services Workshop
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Transcript Legacy Network Gateways - Emergency Services Workshop
LNG
for
NG 9-1-1/ NG 1-1-2
Realization of IETF Standards
for the operational use
in a Legacy Network Gateway
for
Next Generation Emergency Communication Centers
Gregor Jänin, ENP
5/13/10
Background
• Work being done:
• Detailed Functional and Interface Specification
for the NENAi3 Solution- Stage3 (Chapter 7)
based on ideas from Theresa Reese (Telcordia)
• Plans towards pure IP systems, and the truth
• Studies for a master thesis
• requests from the PSAP’s
• need of a LNG as COTS product
Big Picture
Clients
Access Networks
Emergency Services IP Network (ESInet) Domains
Origination Networks
Government
Services
Legacy PSAP/Emergency
Responders
Legacy PSAP
Gateway
IM Clients
LISs
CSP
Call Server
Multimedia
Services
Public Web
Services
DNS
NG9-1-1 (i3) PSAP
ESInet
SIP/H.323
Originating
Border Control
Global Internet,
Private Networks
or IMS
Public Access
IP Networks
ESInet
clients
E-CSCF
(IMS) Location Validation
Web Interface
ECR
Web
Interfaces
Originating
ESRP
Terminating
Border Control
Legacy
Network
Gateway
Wireless/IP
Client
Emergency Call Routing &
Location Validation
Databases
Terminating
ESRP
Private Web
Services
Supplemental
Services
Databases
NG9-1-1 (i3) PSAP
Legacy CircuitSwitched Networks
PSTN client
Wireless/CS
Client
“NG-911” at the moment
IP Network of
Telecoms
(VoIP)
pure wire
circuit switched
connection
ANI/ALI
request
PSAP
IP Network
(VoIP)
ESInet, what’s the right way
?
Standard
PSTN 2 VoIP
Gateway
Gateway overview
placing a Gateway now
• using a standard PSTN 2 VoIP gateway
Job of a LNG
Discovering & Calling
a PSAP with ECRIT
Client
DHCP/DNS
Server
Location
Information
Server
LoST
Server
PSAP
DHCP INFORM
access domain
H
E
L
D
DNS NAPTR
(access domain)
at initial start of LNG
LIS URI
HELD
with every call
location
E
C
R
I
T
LoST (location)
PSAP URI
connect
i3 defined LNG-Functions
• PIF
Protocol Interwork Function
• NIF
NG 9-1-1 / 1-1-2 Specific
Interwork Function
• LIF
Location Interwork Function
looking inside a LNG
PIF
Protocol Interwork Function
Legacy Interfaces(circuit switched)
Ethernet IP interfaces (“legacy” side)
Border Control Function (BCF)
NG 911 Specific Interwork Funct. (NIF)
Ethernet IP interfaces (ESInet side)
NG 112/911
spec. Interwork Function
PIF (receiving call information)
LIF
ECRF
PIF (delivering processed call information)
LIF
Protocol Interwork Function
connection to individual LIS
using HELD
CAMA
vs.
ISDN
Data for lookup available
(with ISDN )
Result with CAMA: delay of call setup
possible scenario with CAMA
best effort call forward
also used if LIS does not respond in time!
outgoing call via LNG LPG
• works as Legacy PSAP Gateway
• handover to other ESInet
• Standard Call Gateway
pure IP- world
in the US 2020 ???
in the EU 2025 ???
Q & A ??
thanks for staying awake..
contact:
Gregor Jänin, ENP
+43 664 357 3632 (GMT+2)
[email protected]
for Questions about 112 Operations Committee
[email protected]