Nortel Networks 7400 - Manual (Page 128)

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Internet Telephony
Gateway (ITG) Trunk
Overview
With today’s widespread deployment of Internet Protocol (IP) networks, organisations are looking for
new ways to maximise their investments by converging their voice and data network infrastructures.
The Meridian Internet Telephony Gateway (ITG) Trunk is an Intelligent Peripheral Equipment (IPE) card that
acts as a gateway to convert real-time voice and fax information into IP packets to send across an IP WAN
(Wide Area Network) or IP MAN (Metropolitan Area Network). ITG Trunk provides an integrated solution for
high-quality voice transmission over an IP network with the benefit of ISDN networking features. ITG Trunk is
an excellent incremental step in the migration toward IP telephony. Customers can incorporate IP telephony
into their networks at a pace that makes sense for their business requirements.
Internet Telephony Gateway (ITG) Trunk
Customer Profile
• New and existing multi-site customers of
Meridian 1 systems that need to network to other
Meridian 1 and/or BCM systems
• International sites already connected via IP data
networks can save money using IP telephony toll-
bypass
• Customers that pay high per-minute charges for
local calls between sites can also use
IP telephony as a lower cost alternative to
PSTN calls
• Multi-site customers that need additional
signalling between sites, for feature-enabling and
sharing of centralised resources
(like voice mail)
• Customers with sites already interconnected via
both an IP network and multiple point-to-point
tie lines
• Multi-site customers interconnected via
high-speed IP networks (MAN/Optical)
Typical Applications
ITG Trunk is an important element of
Nortel Networks High Performance Network
Architecture by facilitating the convergence of voice
and data on the Meridian 1 platform. With this
product, an existing IP-based data network can be
used for voice and fax traffic. With ITG’s support of
ISDN signalling, customers will also be able to take
advantage of such productivity enhancers as
network-wide Calling Party Name and Number
display. Centralised access to powerful Meridian 1
services like CallPilot messaging and attendant
services can also be used network-wide through
support of ISDN.
Key Points
• Provides VoIP with full MCDN feature
transparency including centralised and
networked applications between Meridian 1s
• Migration to VoIP is transparent to the end user
as no change in dialling sequence or feature
operation is necessary
• Installs neatly into existing Meridian 1 shelf and is
easily managed using Meridian 1 automatic least
cost routing tables
• Meridian 1 automatic least cost routing table will
always try and send voice calls over ITG trunk but
will revert to ISDN in cases of WAN congestion or
outage as continually monitored by ITG trunk
card
• ITG trunk does not require a nailed up, dedicated
connection between each Meridian 1 but instead
ITG trunk card resources are shared across the
whole network.
• Carrier class reliability with resource pooling and
n x redundancy with the ITG trunk cards
• Nortel Networks provides the ITG Trunk products
to enable customers to deploy
IP Telephony across an existing IP-WAN