ISDN

Call-By-Call Overview

Call-by-Call Line Sharing

The Call-by-Call feature enables you to reserve (dedicate) a specific number of channels for a specific trunk group, such as DID or Tie lines, and to enable a specific number of channels (lines) to be shared. Shared lines are automatically pooled when they are not in use and can be used by other trunk groups within the channel group to service calls on a Call-by-Call basis. The Reserved quantity of lines for one trunk group cannot be used by other trunk groups and are dedicated to the assigned trunk group service.

Example 1

In Call-by-Call, each trunk group has a number of channels reserved as “minimum” and a number of channels available to be shared. Shared channels are available on a Call-by-Call basis.

For example, in Figure 7-2, 11 channels (2 + 5 + 4 = 11) are programmed as the minimum number of reserved channels in Trunk Groups 1, 2 and 3. To determine the number of channels available to be shared, subtract the minimum channels from the 23 total channels (23 - 11 = 12).

ISDN

 

ISDN

 

Channel Group 1

Trunk Group 1

 

 

1

2 programmed as minimum

 

 

for 800 numbers

 

 

2

 

 

 

 

 

3

 

 

 

 

 

4

 

 

 

Trunk Group 2

23

total channels

5 programmed as minimum for DIDs

-11

minimum channels

 

 

 

 

12

shared channels

 

 

Trunk Group 3

 

 

4 programmed as minimum

23

 

for Tie line calls

The 12 shared channels are available to all three trunk groups on a Call-by-Call basis, first come, first served.

4915

B-Channels

Minimum

ISDN Channel Group 1

You can reserve B-channels for trunk

has 23 B-channels available

groups by programming them as

for Trunk Groups 1, 2 and 3.

“minimum.” Trunk Group 1 above has

 

2 minimum, Trunk Group 2 has 5,

 

and Trunk Group 3 has 4. There are a

 

total of 11 (2 + 5 + 4) minimum

 

channels.

Shared

The number of shared channels available for a particular trunk group varies dynamically according to the usage by other trunk groups.

Figure 7-2 Example 1 – Call-by-Call and Min/Max Control

Strata DK Programming 5/00

7-11

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Toshiba DK424I, dk14, DK40I manual Call-by-Call Line Sharing
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DK424, DK424I, DK40I, dk14 specifications

The Toshiba DK14 and DK40I are advanced digital video recorders (DVRs) that have redefined the standard for high-quality video surveillance systems. Designed primarily for security applications, both models boast a suite of impressive features, making them ideal choices for various environments, including commercial, retail, and educational settings.

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