Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

|NAME OF SUBSIDIARY*                              |  | STATE OR OTHER JURISDICTION OFINCORPORATION OR ORGANIZATION
|------------------------------------------------ |  | -----------------------------------------------------------
|Tekelec Argentina S.R.L.                         |  | Argentina                                                  
|Tekelec International Australia Pty Ltd          |  | Australia                                                  
|Tekelec International, SPRL                      |  | Belgium                                                    
|Tekelec do Brasil Ltda.                          |  | Brazil                                                     
|Tekelec Canada Inc.                              |  | Canada                                                     
|Tekelec Columbia Ltda.                           |  | Columbia                                                   
|Tekelec Czech Republic s.r.o.                    |  | Czech Republic                                             
|Tekelec International Inc.                       |  | Delaware                                                   
|Tekelec France SAS                               |  | France                                                     
|iptelorg GmbH                                    |  | Germany                                                    
|Tekelec Germany GmbH                             |  | Germany                                                    
|Tekelec Hong Kong Limited                        |  | Hong Kong                                                  
|Tekelec Systems India Private Limited            |  | India                                                      
|Tekelec Italy s.r.l.                             |  | Italy                                                      
|Tekelec Malaysia Sdn. Bhd.                       |  | Malaysia                                                   
|mBalance (Malaysia) Sdn Bho                      |  | Malaysia                                                   
|Tekelec Mexico S. de R.L. de C.V.                |  | Mexico                                                     
|Tekelec Netherlands Group B.V.                   |  | The Netherlands                                            
|Tekelec Netherlands B.V.                         |  | The Netherlands                                            
|Tekelec Netherlands Research B.V.                |  | The Netherlands                                            
|Tekelec Netherlands Research North B.V.          |  | The Netherlands                                            
|Tekelec Netherlands Research North-East B.V.     |  | The Netherlands                                            
|Tekelec Netherlands Research North-West B.V.     |  | The Netherlands                                            
|Tekelec Netherlands Research South B.V.          |  | The Netherlands                                            
|Tekelec Netherlands Research West B.V.           |  | The Netherlands                                            
|mBalance Research South-East B.V.                |  | The Netherlands                                            
|Tekelec Singapore Pte. Ltd.                      |  | Singapore                                                  
|mBalance (Asia) Pte Ltd                          |  | Singapore                                                  
|mBalance (Asia Pacific) Pte Ltd                  |  | Singapore                                                  
|Tekelec Telecomm Equipment (Proprietary) Limited |  | South Africa                                               
|Tekelec Spain, S.L.                              |  | Spain                                                      
|Tekelec Taiwan Co., Ltd.                         |  | Taiwan                                                     
|Tekelec Limited                                  |  | United Kingdom                                             

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*  The subsidiaries of the Registrant do not do business under any name other than as listed above.

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