Exhibit 7.1

TELEFONOS DE MEXICO, S.A.B. DE C.V. AND SUBSIDIARIES

RATIOS OF EARNINGS TO FIXED CHARGES

Millions of Mexican pesos with purchasing power at December 31, 2007



|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|--------------------------------------------------- |  | ------ |  | ------ |  | ------ | - |  | ------ | - |  | ------ | -
|CONCEPT                                             |  | 2007   |  | 2006   |  | 2005   |   |  | 2004   |   |  | 2003   |  
|Mexican FRS:                                        |  |        |  |        |  |        |   |  |        |   |  |        |  
|Income from continuing operations before income tax |  | 40,508 |  | 39,890 |  | 38,468 |   |  | 41,306 |   |  | 35,102 |  
|Less:                                               |  |        |  |        |  |        |   |  |        |   |  |        |  
|Equity interest in net income (loss) of affiliates  |  | 17     |  | 9      |  | (20    | ) |  | (120   | ) |  | (210   | )
|Plus:                                               |  |        |  |        |  |        |   |  |        |   |  |        |  
|Fixed charges:                                      |  |        |  |        |  |        |   |  |        |   |  |        |  
|Interest expense                                    |  | 6,615  |  | 6,952  |  | 6,409  |   |  | 5,708  |   |  | 6,453  |  
|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|Earnings under Mexican FRS                          |  | 47,106 |  | 46,833 |  | 44,897 |   |  | 47,134 |   |  | 41,765 |  
|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|U.S. GAAP:                                          |  |        |  |        |  |        |   |  |        |   |  |        |  
|Income before income tax                            |  | 50,375 |  | 42,187 |  | 41,655 |   |  | 43,208 |   |  | 37,806 |  
|Less:                                               |  |        |  |        |  |        |   |  |        |   |  |        |  
|Equity interest in net income (loss) of affiliates  |  | 735    |  | 514    |  | 340    |   |  | (128   | ) |  | (210   | )
|Plus:                                               |  |        |  |        |  |        |   |  |        |   |  |        |  
|Fixed charges:                                      |  |        |  |        |  |        |   |  |        |   |  |        |  
|Interest expense                                    |  | 8,117  |  | 8,275  |  | 8,250  |   |  | 6,785  |   |  | 6,366  |  
|Interest capitalized                                |  | 113    |  | 117    |  | 113    |   |  | 61     |   |  | 116    |  
|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|Total                                               |  | 8,230  |  | 8,392  |  | 8,363  |   |  | 6,846  |   |  | 6,482  |  
|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|Plus:                                               |  |        |  |        |  |        |   |  |        |   |  |        |  
|Depreciation of capitalized interest                |  | 368    |  | 485    |  | 616    |   |  | 625    |   |  | 645    |  
|Less:                                               |  |        |  |        |  |        |   |  |        |   |  |        |  
|Interest capitalized                                |  | 113    |  | 117    |  | 113    |   |  | 61     |   |  | 116    |  
|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|Earnings under U.S. GAAP                            |  | 58,125 |  | 50,433 |  | 50,181 |   |  | 50,746 |   |  | 45,027 |  
|                                                    |  |        |  |        |  |        |   |  |        |   |  |        |  
|RATIOS OF EARNINGS TO FIXED CHARGES:                |  |        |  |        |  |        |   |  |        |   |  |        |  
|Mexican FRS                                         |  | 7.1    |  | 6.7    |  | 7.0    |   |  | 8.3    |   |  | 6.5    |  
|U.S. GAAP                                           |  | 7.1    |  | 6.0    |  | 6.0    |   |  | 7.4    |   |  | 6.9    |