Toshiba DK424I, dk14, DK40I manual Call-by-CallLine Sharing, 7-11, Example

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