Specifications

ENT_MLE_015989 - Ed 02_2014-10-13
Chapter 13: Topology – Network Services
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Alcatel-Lucent Enterprise Communication Solutions
April 2014 Offer
average traffic requirements and overflow traffic during peak traffic periods to an alternative network,
as illustrated below:
Service characteristics
The Alcatel-Lucent VPN configuration offers full ABC services regardless of the network used for voice
transport. Telephone signaling always uses a reserved channel in the digital leased line (D channel).
The application uses virtual direct inward dialing (DID) to overflow calls when the leased line is
saturated. A limited set of DID numbers are reserved for this service (according to the traffic), so as
to integrate users with or without DID numbers into the network while saving DID subscription costs.
The network manager can precisely configure overflows. The service can be assigned user-by-user,
so that the cost remains under control, while guaranteeing a good quality of service.
When the leased lines are saturated, a voice guide suggests an automatic callback request to a user
who is not entitled to an overflow operation.
In addition, a flag is associated with each overflowed call in the Alcatel-Lucent OmniPCX Enterprise
Communication Server metering (accounting) application. This gives the network manager precise
data to analyze to ensure the service remains consistent over a period of time.
ABC VPN without leased line for voice
For some configurations with low traffic levels, a dedicated digital T1/E1 line is not cost effective.
Today, many enterprises have switched from owned leased line networks to managed-switched voice
networks (voice VPN).
For such topologies, the Alcatel-Lucent OmniPCX Enterprise Communication Server interconnects
systems with full ABC services using the PSTN to support ISDN services, or a private QSIG network to
transport voice and a permanent line to transport signaling, as shown below.
IP network: