IMG 1010 - Configuring ISDN Signaling
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Overview: (NFAS)
Follow the procedures below to configure a D-Channel on the IMG using NFAS (Non Facility Associated Signaling). Once the D-Channel is configured then the B-channels can be configured under the Channel Group Pane.
Previous Task:
IMG 1010 - Configuring T1 or E1 Bearer Spans - 10.5.x (10.5.x and above)
IMG 1010 - Configuring T1 or E1 Signaling Spans - 10.5.x (10.5.x and above)
IMG 1010 - T1 Physical Span - 10.3.x (10.3.x)
IMG 1010 - E1 Physical Span - 10.3.x (10.3.x)
Configuring a D Channel using NFAS
Note: Below is procedure on how to configure ISDN with NFAS. The procedure can be followed for configuring ISDN with FAS also. The difference is in FAS there will be a d-channel configured on every span.
Right Click on the Physical IMG:Name ID:0 object pane in ClientView and select New Signaling.
Right-Click on the Signaling object pane in ClientView and select New ISDN. An ISDN D-Channel object will get created. See screen capture below.
To create the D-channel, right-click on the ISDN D Channels object pane just created and select New ISDN D Channel. The ISDN D-Channel Pane will get created. See Below
Complete the fields as required. Below are explanations for each field
Primary Interface - Offset - This field is a drop down menu that contains all the spans configured. Select from the menu which span the D-Channel will get configured on
Primary Channel - Select from drop down menu which Channel the D-Channel will get configured on. (Default is Channel 23)
NFAS Supported - Select Yes from drop down if NFAS is being configured. Select No if configuring FAS
Secondary Interface - Offset - Use this field to configure a secondary D-Channel if applicable. From drop-down menu select which span the secondary D-Channel will get configured on. The Default is "Not Used"
Secondary D-Channel  - If configuring a secondary D-Channel select which channel the secondary D-Channel will get configured on. The Default is "Not Used"
Base Variant - Select from the drop down menu what the Base Variant will be used. Verify that the correct side is being configured. (Either User or Network).
Note: Depending on which Base Variant is being configured will dictate how many B-Channels can get configured. Below is a list of the variants supported and number of B-Channels that can get configured for each. The table below does not include the span that the D-Channel is configured on.
 Number of Spans Configurable per Base Variant (T1):
BASE VARIANT (Network or User) | B-Channels IMG 1010 | B-Channels IMG (1004) |
National-ISDN 2 (NI2) | 20 Spans (479 Channels) | 4 Spans (95 Channels) |
ATT 4ESS Q.931 PRI | 10 Spans (239 Channels) | 4 Spans (95 Channels) |
ATT 5ESS Q.931 PRI | 10 Spans (239 Channels) | 4 Spans (95 Channels) |
Northern Telecom DMS-100 Q.931 PRI | 10 Spans (239 Channels) | 4 Spans (95 Channels) |
Northern Telecom DMS-250 Q.931 PRI | 10 Spans (239 Channels) | 4 Spans (95 Channels) |
JATE | 10 Spans (239 Channels) | 4 Spans (95 Channels) |
Net5 Q.931 (10.3.3 ER2) | 10 Spans (239 Channels) | 4 Spans (95 Channels) |
 Number of Spans Configurable per Base Variant (E1):
BASE VARIANT (Network or User) | B-Channels IMG 1010 | B-Channels IMG 1004 |
EURO-ISDN | 10 Spans (319 Channels) | 4 Spans (127 Channels) |
JATE (INS 1500) | 10 Spans (319 Channels) | 4 Spans (127 Channels) |
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B Channel Selection - Select from a drop down menu how to access the B-Channels. The Default is Linear Clockwise.
HDLC Bit Polarity - Select from drop down menu whether Bit Polarity is Normal or Inverted.
Network Side Layer 2 Overide - Used for Indication of Network or User Only.
Location - The value populated in the Location parameter in the Cause IE when a call is released. See Table Below.
Property | Value |
User | (0x0 - Message Generated by User) (default) |
Private Network | (0x1 - Message generated by private network serving the local user) |
Local public network | (0x2 - Message generated by public network serving the local user) |
Transit network | (0x3 - Message generated by transit network) |
Remote public network | (0x4 - Message generated by public network serving the remote user) |
Remote private network | (0x5 - Message generated by private network serving the remote user) |
International network | (0x7 - Message generated by international network) |
Network Beyond Interworking Point | (0xA - Message generated by network beyond inter-working point) |
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At this point the D-Channel has been configured. The next few steps will explain how to create the B-Channels that will be controlled by this D-Channel just configured.
Configuring B-Channels
Right Click on the Dialogic IMG EMS object pane and select New Routing Configuration.
Right Click on Routing Configuration object pane and select New Channel Groups.
Right Click on Channel Groups object pane and select New Channel Group. The Channel Group Pane that appears has a lot of information. See IMG 1010 - Channel Grouplink for information on each field. The two fields that have to be filled out are as follows:
Name: Enter a name that identifies this Channel Group
Signaling Type: Select ISDN from the drop down menu
Right Click on the ISDN Channel Group created and select New ISDN Group. See IMG 1010 - ISDN Group link for more information on how to fill out this pane. The one field that needs to be configured is the ISDN D-Channel field. This field will have all the D-Channels configured along with what span it is on. Select which D-channel you would like to configure.
Right Click on the ISDN Group and select ISDN Circuits. This is the pane that the B-Channels will get configured on. See screen capture below of B-Channel Pane
Populate the fields. Below is brief description on each field
IMG Interface- Select from drop down menu whether the b-channels will be configured on a Bearer Span or a Signaling Span. The Default is Bearer
Start Interface Offset- Select the Starting Span. This is usually the same span that the D-Channel got configured on previously
Start Channel- Select the Starting Channel
End Interface Offset- Select from drop down menu the last span that the B-Channels will get configured on.
End Channel- Select from drop down menu ending channel
Start Facility Number- The number of the first Facility in the group. Defaults to 0 and counts up from there
Note: In the example above the Base Variant selected was NI2. On the IMG 1010 this Variant allows 20 spans of B-Channels to be configured. Other Variants will allow less. See Base Variant Table above for reference. Start Interface Offset = 0
End Interface Offset = 19
Below the Start Facility Number are monitoring fields.
Trunk Type- T1 or E1 will be displayed
B-Channel Count- Number of B-Channels. In this example:
(20 spans * 24 Channels = 240 Channels)
(240 Total Channels - 1 D-Channel = 239 B-Channels)
Channel Count- Total Number of Channels including D-Channels
At this point you have configured a D-Channel controlling 239 B-Channels.