Virtual TNs (VTNs) enable configuration of service data for an IP Phone,
such as key layout and class of service, without requiring the IP Phone to be
dedicated (hard-wired) to a given TN on the Voice Gateway Media Card.
Calls are made between an IP Phone and circuit-switched telephone/trunks
using the full CS 1000 and Meridian 1 feature set. Digital Signal Processor
(DSP) channels are allocated dynamically for this type of call to perform the
encoding/decoding required to connect the IP Phone to the circuit-switched
network.
To create an IP Phone using VTNs, create a virtual superloop in LD 97.
• Up to 1024 VTNs can be configured on a single virtual superloop for
Large Systems, CS 1000M Cabinet and CS 1000M Chassis systems, and
CS 1000E systems
• Up to 128 VTNs can be configured on a single virtual superloop for
Meridian 1 Option 11C Cabinet and Meridian 1 Option 11C Chassis
systems, leading to support for a maximum of 640 VTNs for each of
these systems.

Description

IP Line Description, Installation, and Operation

• Up to 1024 VTNs can be configured on a single virtual superloop for
CS 1000S systems. Table 11 describes the virtual superloop and virtual
card mapping on a CS 1000S system. Each superloop has two ranges of
cards.
Each ITG-P 24-port line card provides 24 physical TNs and each Media Card
32-port line card provides 32 physical TNs. The physical TNs are the gateway
channels (DSP ports).
Configure the physical TNs (IPTN) in LD 14. They appear as TIE trunks
without a Route Data Block (RDB).

Virtual TNs enable service data to be configured for an IP Phone, such as key
layout and class of service, without requiring a physical IP Phone to be
directly connected to the Call Server.
The concentration of IP Phones is made possible by dynamically allocating a
port (also referred to as a physical TN) of the Voice Gateway Media Card for
a circuit-switched- to-IP Phone call. All system speech path management is
done with physical TNs instead of virtual TNs.
The channels (ports) on the Voice Gateway Media Cards are pooled
resources.
The IP Phones (virtual TNs) are defined on virtual superloops.

96 61-64 81-84
100 65-68 85-88
104 69-72 89-92
108 73-76 93-96
112 77-80 97-99

A virtual superloop is a hybrid of real and phantom superloops. Like phantom
superloops, no hardware (for example, XPEC or line card) is used to define
and enable units on a virtual superloop. As with real superloops, virtual
superloops use the time slot map to handle IP Phone (virtual TNs)- to-IP
Phone calls.