Further Information on Line Test error messages

Owned by Nathaniel Halbrooks
Last updated: Feb 06, 2024
5 min read

Linecheck is a utility supplied by Dialogic to test whether a Diva Media Board can successfully communicate over an ISDN line. If successful, it indicates that the Diva Board is both installed properly and is communicating correctly with the ISDN network. If unsuccessful, the utility will generate one of the error messages listed below. 

Click on an error message to view an explanation of the possible cause and suggested actions to resolve the problem. 

Linecheck Results:

Success! Line Check test passed

This is the successful (and desired) outcome of the Line Check test. It indicates that the Diva Board is installed correctly and is communicating with the network.

NOTE

This is not an exhaustive test and does not necessarily mean that all calls placed through the card will always work. If you are still experiencing problems please try using either the Diva Acopy2 or Testfax utilities to make and receive some test calls.

Failure! No ISDN card found. DIVA software not correctly installed

This Line Check utility is unable to locate any Diva card in your system.

Failure! ISDN card does not work correctly. Installation probably not correct

The Line Check utility has located a Diva card on your system, but is unable to communicate with it.

Failure! Unknown error. A resource conflict probably exists in your system or the Diva card has been removed

The Line Check utility has located a Diva card on your system, but is unable to communicate with it. This is probably due to a conflict with other devices in your computer.

  • Use Windows 'Device Manager' to look for resource conflicts (indicated by a yellow exclamation mark next to the device). If so, then try and reallocate Interrupts (IRQs) or memory resources to resolve the conflict.

  • Update your BIOS by downloading the latest version from the manufacturer

  • Ensure that the card has been assigned a fixed IRQ within the BIOS

  • Ensure that the BIOS entry relating to 'Plug and Play Operating System' is set to 'Yes'. 

  • Try swapping the card into a different PCI slot.

If the problem persists, try the card in another computer to confirm whether the card is functioning correctly or not.

Failure! Test aborted with an error

The message will report some additional information:

Layer 1 error. Check cable/NT1

Check that the cable is plugged into the Diva card. In the case of a Diva 4BRI, check that the cable is connected to the port that you are testing. Beware if you have LAN adapter in your PC that you have not connected the ISDN line to this card.

Suggested remedial actions:

a) There is a problem with the cable or the NT1 box on the wall. Try changing the cable, and confirming that the NT1 is functioning by trying another ISDN device on the line. (You can use a standard  'Cat 5' Ethernet cable to swap out for the ISDN cable.)

b) You have a Point-to-Point line, and have configured your line as a Point-to-Multipoint line within the Diva software. Please confirm that you have the correct settings for your line within your configuration. 

c) There is a problem with the BIOS:

  • Update your BIOS by downloading the latest version from the manufacturer

  • Ensure that the card has been assigned a fixed IRQ within the BIOS

  • Ensure that the BIOS entry relating to ' Plug and Play Operating System' is set to 'Yes'. 

  • Try swapping the card into a different PCI slot.

    If the problem persists, try the card in another computer to confirm whether the card is functioning correctly or not.

TEI Error

Repeat the test. If the problem is persistent, you may need to change the card configuration to match your ISDN line.

Layer 2 error

This error indicates that although the card can communicate with the ISDN network, it has been configured incorrectly. Please check:

Required Information Element is missing

The Linecheck program sends out a 'dummy' call to the phone switch to test that the ISDN card can physically speak to the switch. (In the analogue world, this would be the equivalent of lifting the handset on the phone and hearing the dial tone.)

Since Linecheck is attempting to make a call with effectively no telephone number, some switches do not like this. From the switch's point of view, it doesn't make sense to receive a message to make a phone call with no telephone number. This is what the "Mandatory information element is missing" message means. 

So, in this instance, while this may seem like a message indicating failure, the very fact that a message has been received back from the PBX means that Linecheck was in fact successful.

No circuit/channel available

The most obvious cause for this error message is simply that the line is busy - i.e. another call is in progress on the line. If that is not the case, however, then there is a problem with the line being unavailable, and the service provider should be contacted. 

Information element not existent or invalid

This error message usually indicates a problem with the ISDN Network and the service provider should be contacted.

Recovery on Timer Expiry

This message means that you have not configured your card correctly for the line. Please check:

This message normally means that your PBX uses the QSig protocol, and that the Diva Card has not been configured correctly to match the settings on your PBX. Confirm the correct QSig settings with your PBX engineer and configure these for your Diva card.

Failure! Unknown error. Please contact support

Internal Line Check error.

If you continue to experience difficulty, please contact Dialogic Diva Support for further assistance.

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