How To Fix T5021 - Access to the telephone network failed (0x&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: T5 - SAPphone: Messages for telephony

• Message number: 021

• Message text: Access to the telephone network failed (0x&1)

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message T5021 - Access to the telephone network failed (0x&1) ?

  The SAP error message T5021, which states "Access to the telephone network failed (0x&1)," typically indicates an issue with the integration between SAP and the telephony system. This error can occur in scenarios where SAP is trying to access telephony services, such as when using the SAP Telephone Integration (CTI) or SAP Business Communication Services.
  Causes:
  
  
  Configuration Issues: Incorrect configuration settings in the telephony system or in the SAP system can lead to this error.
  Network Problems: Network connectivity issues between the SAP system and the telephony system can prevent access.
  Telephony System Down: The telephony system may be down or not responding.
  Authorization Issues: The user or system may not have the necessary permissions to access the telephony services.
  Software Bugs: There may be bugs or compatibility issues in the SAP software or the telephony software.
  
  Solutions:
  
  Check Configuration: Verify the configuration settings in both the SAP system and the telephony system. Ensure that all parameters are