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The WAN Call Directory is a list of WAN call destination configurations that you want to use for each virtual circuit. You must create at least one WAN call destination configuration for each destination you want to communicate with. WAN call destination configurations contain parameters that NetWare Link/X.25 applies when establishing and maintaining calls to the destination.
Two basic types of call configurations are possible: permanent and on-demand. You can specify permanent calls for switched or dial-up circuits, as well as for leased lines. If the connection fails, it is retried at periodic intervals. This type of connection is suited for use with dynamic routing protocols, such as RIP or the NetWare Link Services ProtocolTM (NLSPTM) software.
On-demand calls specify that the connection should be established only when needed. Maintenance data, such as routing updates, is suppressed. These types of connections are terminated when the link is void of network data longer than the configured Idle Line Timeout value. A connection failure is retried only when more network data is directed to the remote destination.
For more information, refer to Understanding.
Before you begin, make sure you have installed a WAN board and configured a NetWare Link/X.25 interface.
To configure WAN call destinations for X.25 interfaces, complete the following steps:
Load NIASCFG, then select the following parameter path:
Select Configure NIAS > Protocols and Routing > WAN Call Directory
Press Ins to configure a new WAN call destination.
Enter a name of up to 47 alphanumeric characters for the new WAN call destination, then press Enter.
The WAN call destination name you enter here is used in other menu options when a WAN call destination name needs to be identified. You should use a descriptive name such as the name of the remote destination or a branch office or store number.
A list of supported wide area media is displayed. These media are available on previously configured interfaces. X.25 is not available if you have not yet configured an X.25 interface.
NOTE: If you did not install a WAN board and configure an interface before attempting to configure a WAN call destination, the following message is displayed:WAN network interfaces must be configured before WAN Call Destinations may be created.
You must install a WAN board and configure an X.25 interface, as described in the previous section.
Select X.25-Host as the wide area medium, then press Enter.
The X.25 Call Destination Configuration menu is displayed. The Call Destination Name field is a read-only field. It displays the name you entered in the WAN Call Destination menu.
In the Call Type field, accept the default value, Permanent, or press Enter to select On-Demand from a pop-up list.
Permanent calls can be specified for switched or dial-up circuits, as well as for leased lines. If the connection fails, it is retried at periodic intervals.
On-demand calls specify that the connection is established only when needed. The connection is terminated when the link is void of network data longer than the configured Idle Line Timeout value. A connection failure is retried only when more network data is directed to the remote destination.
Permanent calls can be placed only through a specific interface; they cannot be directed to an interface group.
On-demand calls can be placed through either a specific interface or an interface group, but not both.
NOTE: For on-demand calls, the Interface Group and Interface Name parameters are mutually exclusive. If you specify an interface group, you cannot specify an interface name.
If you specify On-Demand as the Call Type and have defined an interface group, do the following:
The X.25 Interface Group pop-up menu is displayed, listing the configured X.25 interface groups, if any. This is a read-only list that allows you to select the name of the X.25 interface group through which this WAN call destination can be accessed.
If you specify On-Demand as the Call Type but you have not specified an Interface Group name, or if you specify Permanent as the Call Type, do the following:
The Select Interface pop-up menu is displayed, listing the configured X.25 interfaces. This is a read-only list that allows you to select the name of the specific X.25 interface through which this WAN call destination can be accessed.
In the Circuit Type field, accept the default value, Switched Virtual Circuit, or press Enter to select Permanent Virtual Circuit from a pop-up list.
The pop-up list allows you to select the type of virtual circuit used to establish a connection to the destination: permanent (PVC) or switched (SVC).
PVCs are active whenever the interface is active. SVCs must be explicitly established by a call request or by an incoming call.
NOTE: The source route bridge software does not support PVCs.
The PVC Number and Destination DTE Address parameters that follow are mutually exclusive.
If you specify a permanent virtual circuit, then you must specify a PVC number. You cannot specify a destination DTE address because it is not required.
If you specify a switched virtual circuit, then you must specify a destination DTE address. You cannot specify a PVC number because it is not required.
In the PVC Number field (if Circuit Type is permanent), enter the circuit number.
The PVC number must match the logical channel number (LCN) assigned by the X.25 network service provider at subscription time.
In the Destination DTE Address field (if Circuit Type is switched), enter the address.
This is the X.121 DTE address (up to 15 digits, 0 through 9) assigned to the specific destination DTE.
In the Retry Mode field, accept the mode shown, or press Enter to select another option from a pop-up list.
This parameter specifies the conditions under which a failed connection is retried. All connection failures are reported to the system console and to the Call Manager utility (CALLMGR).
The available options are Never Retry, Retry All Failures, and Retry Self-Correcting Failures. The default is Retry Self-Correcting Failures.
Retry All Failures attempts successive connections with an increasing delay between attempts. The retry interval is initially set to 8 seconds and increases exponentially to the limit.
The maximum delay is set by the Retry Interval Limit parameter (described in Step 11). Depending on the Call Type status (permanent or on-demand), the Retry Limit Handling parameter (described in Step 10) allows retries to either continue at the maximum retry interval or stop when the Retry Interval Limit is reached.
If you select Retry Self-Correcting Failures, X.25-supplied error information is used to differentiate between errors that are self-correcting, such as a busy telephone number, and errors that require user intervention, such as a call authentication failure.
Self-correcting errors are retried, as described for the Retry All Failures option. Errors that require user intervention are not retried.
In the Retry Limit Handling field, press Enter to select the appropriate option from a pop-up list.
This parameter specifies the action taken when the connection retry interval exceeds the Retry Interval Limit (described in Step 11).
For permanent calls, connection retries can either continue indefinitely at the maximum retry interval (which supports unattended operation) or be terminated (the connection fails).
On-demand calls can accept only Stop At Limit, which means that the connection fails when the retry interval reaches the limit.
In the Retry Interval Limit field, accept the displayed value or press Enter to change it.
This parameter specifies the maximum delay between attempts to establish a connection (the retry interval). The delay is set initially to 8 seconds and increases exponentially until the maximum retry interval is reached.
The range of time intervals is 00:00:00 to 23:59:59 (hh:mm:ss). For permanent calls, the default value is 10 minutes (00:10:00). For on-demand calls, the default value is 2 minutes (00:02:00).
In the Idle Line Timeout field (if Call Type is set to On-Demand), accept the value shown or press Enter to change it.
This parameter specifies the time, in hh:mm:ss format, that an on-demand call can be inactive before closing the connection.
The range of values is 00:00:00 through 23:59:59. The default value is 10 minutes (00:10:00).
In the Remote System ID field, press Enter to display a list of X.25 remote system IDs.
This parameter specifies the symbolic name (from 1 to 47 ASCII characters) of the remote peer system associated with this WAN call destination entry. This name is typically the remote system server name.
Use the arrow keys to select a remote system ID, then press Enter, or press Ins to create a new remote system ID.
If you pressed Ins, enter the symbolic name (from 1 to 47 ASCII characters) of the remote peer system associated with this WAN call destination entry in the screen that is displayed, then press Enter and repeat the first part of this step.
The remote system ID value is accessed by the X.25 protocol stack to identify the proper WAN call destination needed to restore an on-demand connection to a remote system that previously initiated a connection to this system.
In the Expert Call Configuration field (if Circuit Type is SVC), press Enter to view or modify the Expert Call Configuration parameters.
The X.25 Expert Call Configuration menu is displayed. The parameters in this menu are applicable only for SVCs.
The Call Destination Name field is a read-only field. It displays the name of the WAN call destination you entered in Step 3.
In the Request Reverse Charging field, accept the default value, No, or press Enter to change it.
This parameter specifies whether reverse charging is requested for calls to and from this destination. The default, No, prevents reverse charging.
In the Window Size field, accept the default value, 0 (no Window Size Negotiation packet layer), or press Enter to change it.
This parameter specifies the size of the window that is negotiated for calls to or from this destination. This value overrides the inbound or outbound window size specified in the X.25 Packet Level Parameters menu. The range of values is 1 to 7 (Modulo 8) or 1 to 127 (Modulo 128).
In the Packet Size field, accept the default value, Not Selected, or press Enter to change it.
This parameter specifies the size of the packet that is negotiated for calls to or from this destination. If this parameter is used, it overrides the inbound and outbound packet sizes specified in the X.25 Packet Level Parameters menu. The optional values are 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, and Not Selected.
In the Throughput Class field, accept the default value, Not Selected, or press Enter to change it.
This parameter specifies the throughput, in bits per second, that is negotiated for calls to or from this destination. The optional values are 75, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 48000, 64000, and Not Selected.
In the CUG Facility field, accept the default value, Not Selected, or press Enter to change it.
This parameter specifies the type of Closed User Group (CUG) used for calls to or from this destination. A CUG permits DTEs belonging to the group to communicate with each other, but precludes communication with all other DTEs. The options are Bilateral, Incoming, Outgoing, and Not Selected.
In the CUG Number field, accept the default value, Not Selected, or press Enter to change it.
This parameter specifies a one- or four-digit hexadecimal number for a specific CUG. If the CUG Facility parameter is set to Incoming or Outgoing, you can enter a two-digit number. If the CUG Facility parameter is set to Bilateral, you can enter up to four digits.
WARNING: Refer to the ITU-T Recommendation X.25 before you set this parameter.
In the Fast Select field, accept the default value, No, or press Enter to change it.
This parameter specifies an optional parameter that a DTE can request for a virtual circuit to allow the use of up to 128 bytes of user data in Call Request packets. You can specify whether the Fast Select option is used for calls to this destination. The options are Yes and No.
In the With Restriction field, accept the default value, No, or press Enter to change it.
This is an addition to the Fast Select parameter that is available only if the Fast Select parameter is set to Yes. This parameter specifies whether the called DTE can accept a call with the Fast Select option. The options are Yes and No.
If this parameter is set to Yes and a call is made using Fast Select with the restriction on, the called DTE must clear the incoming call.
In the Call User Data field, accept the default value, None, or press Enter to change it.
This parameter specifies the actual user data that is sent in the Call Request packet user data field. The length of the user data field depends on whether you use Fast Select.
The following table shows the field lengths, in bytes, that are available, depending on two aspects: whether you are using Fast Select and the specific protocol being used.
| Protocol | With Fast Select | Without Fast Select |
|---|---|---|
IPX |
122 bytes |
10 bytes |
AppleTalk |
122 bytes |
10 bytes |
CLNS |
124 bytes |
12 bytes |
IP |
124 bytes |
12 bytes |
In the Generic ITU-T Facilities Entry field, accept the default value or press Enter to change it.
This parameter lets you add new facilities codes to your current configuration in addition to the facilities already specified.
WARNING: Enter this parameter in hexadecimal format. Refer to the ITU-T Recommendation X.25 before setting this parameter.
In the Generic National Facilities Entry field, accept the default value or press Enter to change it.
This parameter is provided as a convenience for customers requiring the specification of National or Proprietary facilities. A provision for a Facilities Parameter Marker value is also included. This field is convenient for use across an X.25 gateway.
WARNING: Enter this parameter in hexadecimal format consistent with the ITU-T Recommendation X.25. Consult your network representative or technical support for further information.
In the Suppress Calling DTE Address field, accept the default value or press Enter to change it.
This parameter determines whether the calling DTE address is included in the outgoing Call Request packets. The options are Yes and No.
If set to Yes, the called DTE address is not included in the Call Request packet (it is suppressed).
When you have completed all changes to the X.25 Expert Call Configuration parameters, press Esc to return to the X.25 Call Destination Configuration menu.
In the Inbound Authentication Update field, accept the default value, Enabled, or press Enter to select Disabled.
When this parameter is enabled, an update of the inbound authentication database for the X.25 interface (or interface group) associated with this WAN call destination is automatic.
Press Esc; if prompted, select Yes to save the changes to the WAN call destination, then press Enter.
The WAN call destination you just configured appears in the list of configured WAN call destinations.
To configure another WAN call destination, repeat Step 2 through Step 30.
Press Esc to return to the Internetworking Configuration menu.
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