Alcatel-Lucent
ISAM Voice
For smooth migration to NGN/IMS
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As part of their strategic initiative,
service providers should re-evaluate
current service offerings and product
lifecycles, and prioritize services to
be migrated onto next-generation
network architecture. It’s not efficient
to migrate all services to the next-
generation network at the same
time — service providers should take
a step-by-step approach for network
optimization. Network optimization
should be based on increasing network
capacity and improving operational
efficiency.
Dealing with PSTN migration
As an incumbent service provider in an increasingly
saturated fixed voice market, you face the declining
profitability of your PSTN. With severe competition,
the average price per minute of voice calls is decreasing;
moreover, cable operators are offering attractive service
bundles; alternative VoIP providers are offering low tariffs
using third-party access networks, and some customers are
abandoning fixed voice lines in favor of mobile phones.
At the same time, your operational costs are flat at best,
with a trend to increase as the TDM network becomes
older and obsolete. In fact, the eventual cost of running
the network will no longer be justified by the revenue
the network generates.
Yankee Group
To meet these challenges, you are looking to migrate your
PSTN to an IP network. Remaining competitive means
optimizing the delivery of traditional voice services while
creating an all-IP network capable of delivering new voice
and multimedia services. This dual-pronged strategy makes
sense. As broadband penetration continues to grow, you
can combine your investment in the modernization of the
PSTN with the building out of IPTV and high-speed
Internet access networks — two areas currently undergoing
substantial growth. Adopting an IP- and Ethernet-based
platform with the flexibility of bringing fiber as close as
economically possible to the end user, will also let you
achieve your goal of converged voice and data access
networks, with minimum cost of ownership.
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IP Voice Transformation with Alcatel-Lucent ISAM Voice
Bundling opportunities with alcatel-Lucent
ISaM during Ip voice migration
Migrating legacy voice lines
For primary line migration, the Alcatel-Lucent ISAM
family provides a network-based voice solution that lets you
choose either SIP or H.248 as the signaling protocol. With
this network-based solution, packetization occurs in the
access node, so you don’t need to change end-user equipment
and the life-line support model (unlike the CPE-based
approach — the alternative method for voice access).
PSTN transformation is driven by fierce competition,
erosion of voice revenue, network obsolescence, IP network
transformation, bringing fiber closer to the end user, and
the desire to introduce new and compelling voice-related
services. As a result, you need a flexible solution to act on
these challenges.
The Alcatel-Lucent IP-based ISAM — a major component
of both the Alcatel-Lucent Triple Play Service Delivery
Architecture (TPSDA) and the Alcatel-Lucent end-to-
end IP Voice solution — is ideally positioned for PSTN
network transformation.
What’s more, the Alcatel-Lucent ISAM family offers superb
VoIP quality of service (QoS). With advanced queue man-
agement for voice delivery, strict priority over any other
service, you can rest assured of minimum transfer delay.
Together with the support of both SIP and H.248, this
advanced QoS implementation for voice, provides the
most flexible path to IP voice transformation.
Delivering voice and data convergence
with broadband evolution
As you expand your broadband rollout to increase coverage
of IPTV while offering high-speed Internet access, you
can lower the cost of modernizing the PSTN. Your invest-
ment in a true Triple Play Service Delivery Architecture
(TPSDA) meets not only the challenge of obsolescence,
but also lowers operational expenses (OPEX) via unified
training and network management, as well as through
shared spares and software upgrades for voice and broad-
band services. In addition, your OPEX is lowered through
simpler bundled service offerings with self-profiling options
for your customers.
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With the Alcatel-Lucent ISAM family, you can also support
video penetration in flexible deep-fiber scenarios. This en-
ables the optimum reuse of the copper plant and improved
subscriber high-capacity reach. With ISAM Voice, the
Alcatel-Lucent ISAM family also supports the deploy-
ment of legacy PSTN interfaces and NGN/IMS media
gateway functionality over the same platform in order to
facilitate network convergence without discontinuity in
subscriber offerings.
ISaM Voice components
As illustrated in Figure 1, the main hardware components
of Alcatel-Lucent ISAM Voice are:
• an integrated voice packet server (NVPS) for H.248
signaling that interfaces with the NGN/IMS network
through an H.248/Megaco signaling interface. In the
case of SIP signaling, the user agent is hosted on the
line termination card.
• Line termination (LT) boards to interconnect with POTS
lines, ISDN lines (basic access line terminations, BRA)
• Splitter cards
Figure 1. ISaM Voice components
Voice Server (NVPS)
POTS (NPOT)
ISDN (NBAT)
Splitters
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What Alcatel-Lucent ISAM Voice offers
Alcatel-Lucent ISAM Voice compo-
nents provide PSTN-quality VoIP,
completing the future-safe, multiser-
vice ISAM access solution by enabling
innovative triple play services.
such as server/network card redun-
dancy, duplicate power distribution
to the line cards, multiple fans and
clock redundancy. On top of this,
failover mechanisms are available when
connecting to an IMS/NGN network
and lawful intercept is also supported.
pSTn voice in an
nGn/IMS access scenario
In cases where customers decide
a non-blocking architecture
to migrate via a two-step approach,
Alcatel-Lucent ISAM Voice enables
the migration from NGN to the IMS
core with a simple software upgrade.
The Alcatel-Lucent ISAM family
delivers superior-quality VoIP services
due to its treatment of packetized voice
traffic. It applies strict priority schedu-
ling, assuring minimum delay and
premium VoIP quality. Moreover,
scalability is ensured because user
agents are distributed to the linecards.
Carrier-grade voice
Alcatel-Lucent ISAM Voice leverages
comprehensive redundancy concepts
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an advanced
Ip/ethernet platform
one investment
to cover all needs
Minimized opeX in
the installed plant
IP/Ethernet technology is at the core
of the Alcatel-Lucent ISAM family.
These technologies aggregate various
types of services from IP-enabled
line cards to a Gigabit Ethernet
core, including legacy POTS and
ISDN subscriber interfaces. This
approach ensures minimal delay for
voice, minimal cost regardless of the
service mix, the same operation for
any service, and pure IP/VLAN QoS
control, end-to-end.
With Alcatel-Lucent ISAM Voice,
you don’t need to invest twice —
once in voice migration, and again
in broadband access. By using
Alcatel-Lucent ISAM Voice in the
Alcatel-Lucent ISAM family, the
CAPEX and OPEX spent migrating
the voice access network can also
create a broadband access footprint.
With ISAM Voice, you can also
minimize OPEX in the installed
plant. That’s because:
• All services come from a single
multiservice IP/Ethernet access
node, resulting in cost-effective
maintenance, with minimal truck
rolls and inventory of spares
• Pre-cabling combo solutions and
zero-touch service provisioning
for xDSL services or voice services
deliver lower OPEX
• All services are managed by a single
network management system, which
is fully compatible with the man-
agement of any type of Alcatel-
Lucent broadband portfolio.
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Increased deployment flexibility
additional cost-cutting through
central office consolidation
With Alcatel-Lucent ISAM Voice,
you can also offer voice support
with the overlay of existing DSLAM
installations. Alternatively, you can
choose a pre-seeding strategy: first,
by installing Alcatel-Lucent ISAM
in order to deliver xDSL, while pre-
cabling the rack to introduce POTS
or ISDN boards at a later stage. To
support this strategy, the ISAM plat-
form provides a complete and dense
variety of DSL transmission technol-
ogies (ADSL, ADSL2, ADSL2 plus,
VDSL2, S.HDSLbis). With a stan-
dardized concept for 24/48/72 port
assemblies, the wiring is independent
of the services provisioned on ISAM.
With the Alcatel-Lucent ISAM family, you can also move
to more powerful broadband access equipment (with VDSL2)
capable of supporting higher bandwidth out of the central
office (CO). By designing the access network on remote
outdoor housings, you can liberate space from COs, emp-
tying them eventually of all electronics.
You can also reach remote locations with fiber to the
most economical point. This reduces the operational
cost of running the voice access network. Just as good,
you can reduce the size of COs, or even choose to sell
them because they are sometimes located in high-cost
business districts and downtown areas. With this welcome
inflow of money, you can then invest further in core activities.
Future-safe investment
With Alcatel-Lucent ISAM Voice, you can also be sure
that your initial investment retains its value in the future.
Today, for example, voice line cards are software upgrade-
able to support ETSI TISPAN’s latest SIP standards.
In addition, the density of these line cards is regularly
expanded, increasing the density of the voice terminations.
With the ISAM architecture, you can also facilitate the
smooth introduction of new features, such as access border
gateway functionality, reinforcing its flexibility and multi-
service capability.
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Key ISAM voice features
Signaling protocols
emergency calls with H.248/Megaco
Alcatel-Lucent ISAM Voice implements H.248/Megaco
and SIP signaling to connect to NGN/IMS networks.
Ten percent of the call capacity is always reserved for
emergency use, in addition to the 512 active, regular calls
handled by the NVPS with H.248. Because each line card
has its own user agent, ISAM can always initiate an emer-
gency call.
ISaM call control and traffic
dimensioning with H.248/Megaco
Alcatel-Lucent ISAM Voice incorporates a separate
call control engine that can be centralized for as many
as 5,000 subscribers distributed in a number of access
nodes (using either the Alcatel-Lucent 7302 ISAM, the
7330 ISAM FTTN Remote Aggregator or the 7356 ISAM
FTTB Remote Expansion Module). The signaling gate-
way, or NVPS, is not overloaded with payload processing
as this is done in the line card itself. The NVPS handles
signaling events only, and supports up to 10 call attempts
per second.
Voice traffic prioritization
The line card packetizes voice traffic into IP packets with
the highest IP priority. These packets are delivered to the
highest priority virtual local access network (VLAN) queue
of the Alcatel-Lucent ISAM. For voice traffic, the strict
priority queue assures minimum delay.
Alcate-Lucent ISAM Voice
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Combo solutions
Line testing
Voice lines provided by Alcatel-Lucent ISAM Voice can
be delivered from a combo shelf on which voice and DSL
are both provisioned. The combo shelf enables simplified
cabling with MDF, zero-touch service provisioning and
flexible growth of voice or xDSL services.
Metallic Test Access (MTA) is supported for POTS. In-
tegrated line testing is also supported in conjunction with
the Alcatel-Lucent 5530 Network Analyzer, which facilitates
fully integrated narrowband and broadband testing.
part of the end-to-end Ip voice solution
Shortest-path routing for voice calls
As illustrated in Figure 2 Alcatel-Lucent ISAM Voice
is fully integrated with the rest of the Alcatel-Lucent
portfolio to offer end-to-end solutions for the NGN/IMS.
Layered on top of other Alcatel-Lucent products —
intended for the growth of the PSTN network or PSTN
legacy migration - ISAM Voice positions the Alcatel-
Lucent ISAM family, including the Alcatel-Lucent
1540 Litespan MSAN, as the access/voice gateway
for NGN/IMS deployments. These are focused on the
immediate introduction of triple play services. At the
same time, the fully standards-based Alcatel-Lucent
ISAM Voice supports multivendor triple play NGN/IMS
access opportunities.
Local voice calls (calls between two subscribers served
by the same Alcatel-Lucent ISAM node) are not routed
through the NGN backbone, thus decreasing transmission
and backbone capacity consumption.
Common shelves with any ISaM application
New Alcatel-Lucent ISAM Voice hardware and software
can be installed in existing or new Alcatel-Lucent ISAM
standard racks.
Figure 2 . alcatel-Lucent end-to-end Ip voice solution
Broadband
IP endpoints
(new IMS
services)
IMS core
Session
border/
controller
Access node
SIP
HSS
RG
Telephony
Session
SIP
Application
control
Server
Legacy
POTS phones
(PSTN
AGCF
VGW
emulation)
H.248
AGW
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The Alcatel-Lucent advantage
Alcatel-Lucent is best positioned to help you achieve network
optimization by offering triple play services over a cost-effective,
single, converged network. The Alcatel-Lucent ISAM family
offers a future-safe, multiservice intelligent IP broadband access
platform that provides wire-speed delivery of value-added digital
services, including IPTV, VoIP, gaming and teleworking. With the
incorporation of Alcatel-Lucent ISAM Voice, and a choice between
H.248 and SIP, the ISAM family also provides VoIP media gateway
functionality to support a smooth migration of the legacy PSTN
to NGN/IMS.
Alcate-Lucent ISAM Voice 11
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