NEC NDA-24311 Answering Machine User Manual


 
NEAX2400 IPX ISDN Features and Specifications
Page 202
NDA-24311, Issue 1
V-18 Virtual Tie Line
V-18 Virtual Tie Line
General Description
This service feature provides Virtual Tie Line service by setting up a connection between two 2400 PBXs via the
ISDN network during a designated period of time. While Virtual Tie Line is set, one of the B-channels on the setup
connection is used as a CCIS No. 7 signal channel, and the other B-channels as CCIS No. 7 voice channels.
Operating Procedure
No manual operation is required.
Service Conditions
1. The route for Virtual Tie Line service is distinguished from general B-channel routes of other ISDN
trunks. Also, trunks designated for this feature cannot be used as a general B-channel route.
2. The call setup for Virtual Tie Line is available only from the originating office.
3. In the processing of an incoming Virtual Tie Line call, channel selection is made at the terminating office.
4. The number of channels that can be set for Virtual Tie Line is up to 18 channels (3 H0 channels).
5. The number of routes that can be set for Virtual Tie Line is up to three routes per interface.
6. The channels set for Virtual Tie Line must consist of successive channels that form H0 channels, and each
H0 channel is limited as follows:
1 ch to 6 ch
7 ch to 12 ch
13 ch to 18 ch
19 ch to 24 ch Note
7. The signal channel used on Virtual Tie Line must always correspond to the last channel in the H0 channel
unit.
Example: ckt (circuit) =6 (6th channel)
ckt =12 (12th channel)
ckt =18 (18th channel)
ckt =24 (24th channel) Note
Note: This applies only if you have non-associated Dchannel handling.
8. If there is no Virtual Tie Line data assigned for the day, service status of the previous day continues.
Therefore, make sure to assign the data for the next day when setting the service-end time as 23:50.
9. Common Channel Handler (CCH) to be used on Virtual Tie Line corresponds to the route on a one-to-one
basis. Therefore, when several routes of Virtual Tie Line are set on a DTI, the same number of CCHs are
required.
10. When there is a call connected to the Virtual Tie Line at the time designated to cancel the connection, the
connection is extended by 10 minutes (max. 30 minutes) to wait for the call to be released. After 30
minutes, the calls connected to the line are forcibly released. However, when the time set for Virtual Tie
Line service is less than 30 minutes, this procedure is not guaranteed.
11. When setting the connection for this service, that connection is not charged. However, calls using Virtual
Tie Line are charged as general CCIS calls.
12. PEG COUNT [P-7] is not activated when setting the connection for this service. However, calls using
Virtual Tie Line are subject to this feature as general CCIS calls.
13. In case of Virtual Tie Line network, an alternative route for signal transmission cannot be assigned.
(Setting of the alternative route is available in case of general CCIS calls.)