40-400-00001, Rev. A
19
B Channel Provisioning
Some ISDN-BRI communications devices, usually LAN gateways and other Termi-
nal Adapters, do not use ISDN Call Control to establish calls or allocate B Channels.
These devices assume that one or more B Channels are permanently connected or
“nailed up” to a fixed destination. When using real ISDN-BRI lines, one or more
permanently provisioned B Channels are assigned by the telephone company. To
establish one or more permanent channels between the Simulator’s Port 1 and Port
2, or a LOOPBACK configuration,
STEP 1
Run the Windows based configuration software.
STEP 2
Select the B CHANNEL setting.
STEP 3
Change the setting from NONE, Permanent B1, Permanent B2,
Permanent BOTH, or LOOPBACK.
STEP 4
Remove all communications devices from the Simulator and press the
DOWNLOAD button. An automatic RESTART is issued as part of the
DOWNLOAD.
When B Channels are permanently allocated in this way, they are not available to
any devices that use ISDN Call Control to negotiate channel assignment. You can
exploit this fact to test how a device behaves when a line is provisioned for less than
two B Channels.
Caller ID
This service, also referred to as Automatic Number Identification (ANI) or Calling
Line Identification (CLID), allows Terminating Equipment with display support or call
screening features to identify the calling party before accepting the call.
The ISDN switch knows each user’s identity because a SPID or Directory Number is
always associated with a specific line and user name. When a user places a call,
the switch accesses its database to retrieve the calling number and includes it in the
SETUP message sent to the called party. If the called party supports a display, the
calling party’s name and number may be formatted into ASCII text and sent as well.
When the Simulator’s Caller ID setting is set to ON, any calling device, even when it
doesn’t include a Calling Party Number Information Element in its outgoing SETUP
message, is identified by the Simulator and presented to the called party.
To change this setting and test the Caller ID features of a particular device,
STEP 1
Run the Windows based configuration software.
STEP 2
Select Caller Identification.
STEP 3
Change the setting.
STEP 4
Select SAVE to save the setting.
STEP 5
Remove all communications devices from the Simulator and press the
DOWNLOAD button. An automatic RESTART is issued as part of the
DOWNLOAD.
Note: When CALLER ID is set to OFF, the Calling Party Number is not in-
cluded in incoming SETUP messages.