How To Fix T5135 - Specified telephone number not allowed

T5135 - Overview

• Message type: E = Error

• Message class: T5 - SAPphone: Messages for telephony

• Message number: 135

• Message text: Specified telephone number not allowed

What causes this issue?

The telephone number must be selected from the list of deflect numbers.
Other telephone numbers cannot be entered here.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Select another telephone number or inform your system administrator
that the number you require should be inserted in the list of valid
numbers.

Error message extract from SAP system. Copyright SAP SE.

T5135 - Details

• The SAP error message T5135 "Specified telephone number not allowed" typically occurs when there is an issue with the format or validity of a telephone number entered in the system. This error is often encountered in modules related to personnel administration or employee master data, where telephone numbers are required.
  Causes:
  
  Invalid Format: The telephone number may not conform to the expected format defined in the system. This could include issues such as incorrect country codes, missing digits, or the use of invalid characters (e.g., letters or special symbols).
  Configuration Settings: The system may have specific configuration settings that restrict certain types of telephone numbers (e.g., mobile numbers, international numbers).
  Validation Rules: There may be validation rules in place that prevent the entry of certain telephone numbers based on predefined criteria.
  Data Entry Errors: Simple typographical errors during data entry can lead to this error.
  
  Solutions:
  
  
  Check Format: Ensure that the telephone number is entered in the