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| APPLICATION
NOTE: Emergency 911 in Packet Networks |
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HELPING
LECS COMPLY WITH LOCAL REGULATIONS
FOR E911 SERVICES
To
take advantage of efficient data deliveries
and a wealth of new features associated
with revenue-generating voice services,
new local exchange carriers (LECs)are
building out IP data-centric networks.
Voice services are proving to be a continuing,
single source of revenue in the telecommunications
industry. But, to become an LEC, a service
provider must comply with local regulations
that ensure quality, fairness, competitiveness,
and safety. One such key regulation
requires LECs to offer 911/E911 emergency
services to all subscribers.
THE
PROBLEM
While
IP technology has advanced to the
point where it is now routinely deployed
in Voice-over-IP and telephony voice
networks, the unchanged 911/E911
tandems that handle emergency calls
have fallen years behind the current
technologies. Still widely in use,
many 911/E911 tandems do not support
SS7 or IP-based protocols such as
SGCP, MGCP, and SIP, and continue
to require trunking via Multi-Frequency
(MF) tones. Complicating the matter
is the protocol uniqueness of the
operator services that 911/E911 tandems
supply. |
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| TYPICAL
911 PROBLEM |
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The
CLEC provides local voice and data
service over an integrated access
device (IAD). |
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A caller
dials an emergency 911 call. |
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The
converged call comes to the edge
of the VoIP gateway over a transport
technology, such as XDSL enabled
IAD. |
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The
VoIP gateway, MGC, and associated
service control platform plus protocol
(i.e., MGCP) directs the call to
the legacy 911 tandem. |
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The
Media Gateway converts and directs
the bearer traffic and associated
MF call control to the 911 tandem. |
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Incompatibility
occurs between the media gateway
and the 911 tandem. |
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The
911/E911 protocol features support
called-party control, selective
transfer, emergency ringback,
forced disconnect, route diversity,
and calling-party switch hook
status, caller ID and home address
accuracy, and data base access.
LECs face the dilemma of how to
comply with mandatory regulations
and satisfy 911/E911 requirements,
without investing in expensive
network upgrades. |
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THE
SOLUTION
Encore
Networks bridges the gap with its SignalPath™ 230 Signaling
Gateway by enabling seamless call connection
control between the IP network and the
911 tandem.
The
Signaling Gateway provides a rich
software library that supports SS7,
C7, ISDN, R1, R2, and MF. With its
flexible, DSP-based architecture,
the SP230 can
match a network's native signaling
protocol to the local MF 911/E911
tandem. |
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| The SP230 MF
911/E911 features include: |
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Scalable
number of trunks for connection
to 911 tandems |
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ANI
parameter conversion from the native
network protocol |
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Called
Party Hold tracing |
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Emergency
Ringback after disconnection |
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Forced
Disconnect as needed to make the
line available for other incoming
emergency calls |
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Calling
Party Switch Hook Indication to
indicate that the caller has hung
up |
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| TYPICAL
911 PROBLEM |
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Sometimes
the technical shortcomings
of VoIP and ATM equipment
impact business issues in
a very severe way. Supporting
emergency 911 over a converged
application, such as VoIP
(H.323 over DSL), has become
a mission-critical application.
Packet-switched technology
limitations can prohibit a
CLEC from complying with local
regulations. For the new DLEC,
CLEC, and converged service
provider offering local telephone
service, support for emergency
911 is a regulatory mandate. |
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More
and more telecom firms are choosing
the SP230 Signaling
Gateway to solve their signaling
compatibility problems. Encore
Networks' SP230 Signaling
Gateway is already deployed commercially
in 80 countries as the signaling
interoperability solution between
incompatible TDM-based networks,
as well as connecting TDM-based
systems with next-generation packet
networks. We're helping CLECs,
DLECs, and global carriers think
ahead to achieve timely and successful
roll-outs.
The
following are some of the applications
the Signaling Gateway handles:
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SS7
to ISDN (T1 PRI) conversion |
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IP
to SS7 conversion |
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IP
to MF conversion |
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R2
to R2 (country to country) |
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In-band
R1 to ITU-T SS7 conversion |
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ANSI
to ITU-T conversion |
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ETSI
PRI to NI2 ISDN conversion |
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ANSI
SS7 to ITU-T SS7 conversion |
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Multiple
conversions on single platform |
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Rate
conversion: µ-law T1 to
A-law E1 |
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ENCORE
NETWORKS: THE SIGNALING EXPERTS
Encore
Networks' products address many
of the challenges facing next-generation
networks. A leader in SS7 signaling
interworking, Encore Networks
designs signaling solutions that
aim for an efficient delivery
of converged services. The advanced
Signaling Gateway accomplishes
this task by seamlessly binding
networks together.
The
Encore Networks SignalPath interworks
the latest IP-based protocols
with each other and with legacy
PSTN protocols, such as SS7, ISDN,
and CAS. Long-distance carriers,
international voice and data bypass
service providers, ISPs, CLECs,
and voice over packet long distance
service providers all stand to
benefit from the Encore Networks
Signaling Gateway.
Ask
our customers about the value
of our services. Our equipment
is deployed in over 80 countries
world-wide.
Whether
you operate a circuit-switched
or packet network, and whether
you operate in the U.S. or abroad,
Encore Networks has the signaling
solution for you.
Find
out more. Give us a call us today
at (703) 318-7750, contact us
at info@encorenetworks.com,
or visit our web site at www.encorenetworks.com.
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