Exhibit 7.1

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

RATIO OF EARNINGS TO FIXED CHARGES

Thousands of Mexican pesos with purchasing power at December 31, 2005



|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|-------------------------------------------------------------------------- |  | ---------- | - |  | ---------- | - |  | ---------- | - |  | ---------- | - |  | ---------- | -
|CONCEPT                                                                    |  | 2001       |   |  | 2002       |   |  | 2003       |   |  | 2004       |   |  | 2005       |  
|Mexican GAAP:                                                              |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|                                                                           |  |            |   |  |           
|Income before income tax and employee profit sharing                       |  | 45,355,450 |   |  | 37,462,905 |   |  | 38,551,738 |   |  | 44,570,775 |   |  | 43,358,272 |  
|                                                                           |  |            |   |  |           
|Fixed charges :                                                            |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Interest expense                                                           |  | 7,896,859  |   |  | 6,832,612  |   |  | 6,003,161  |   |  | 6,196,196  |   |  | 7,339,696  |  
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Earnings under Mexican GAAP                                                |  | 53,252,309 |   |  | 44,295,517 |   |  | 44,554,899 |   |  | 50,766,971 |   |  | 50,697,968 |  
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Mexican GAAP:                                                              |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Employee profit sharing                                                    |  | 3,368,906  |   |  | 3,393,131  |   |  | 2,809,923  |   |  | 2,916,174  |   |  | 2,863,685  |  
|                                                                           |  |            |   |  |           
|U.S. GAAP adjustments:                                                     |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Total U.S. GAAP adjustments, net                                           |  | (3,688,864 | ) |  | (1,930,261 | ) |  | (807,666   | ) |  | 412,625    |   |  | (1,950,217 | )
|Deferred income tax                                                        |  | (60,088    | ) |  | (301,065   | ) |  | (277,819   | ) |  | 1,899,558  |   |  | 136,170    |  
|Interest capitalized during the period                                     |  | 679,208    |   |  | 397,796    |   |  | 107,088    |   |  | 56,137     |   |  | 104,364    |  
|Depreciation of capitalized interest                                       |  | (544,829   | ) |  | (511,214   | ) |  | (597,299   | ) |  | (578,732   | ) |  | (570,601   | )
|Equity in results of affiliates                                            |  |            |   |  |            |   |  |            |   |  |            |   |  | 250,432    |  
|Minority interest                                                          |  |            |   |  |            |   |  |            |   |  | 16,276     |   |  | (420,174   | )
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|U.S. GAAP adjustments without deferred income tax and capitalized interest |  | (3,763,155 | ) |  | (1,515,778 | ) |  | (39,636    | ) |  | (980,614   | ) |  | (1,450,408 | )
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Earnings under U.S. GAAP                                                   |  | 46,120,248 |   |  | 39,386,608 |   |  | 41,705,340 |   |  | 46,870,183 |   |  | 46,383,875 |  
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Fixed charges:                                                             |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Interest expense under U.S. GAAP                                           |  | 7,217,651  |   |  | 6,434,816  |   |  | 5,896,073  |   |  | 6,140,059  |   |  | 7,235,332  |  
|Interest capitalized during the period                                     |  | 679,208    |   |  | 397,796    |   |  | 107,088    |   |  | 56,137     |   |  | 104,364    |  
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|Fixed charges under U.S. GAAP                                              |  | 7,896,859  |   |  | 6,832,612  |   |  | 6,003,161  |   |  | 6,196,196  |   |  | 7,339,696  |  
|                                                                           |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|RATIO OF EARNINGS TO FIXED CHARGES:                                        |  |            |   |  |            |   |  |            |   |  |            |   |  |            |  
|                                                                           |  |            |   |  |           
|Mexican GAAP                                                               |  | 6.7        |   |  | 6.5        |   |  | 7.4        |   |  | 8.2        |   |  | 6.9        |  
|                                                                           |  |            |   |  |           
|U.S. GAAP                                                                  |  | 5.8        |   |  | 5.8        |   |  | 6.9        |   |  | 7.6        |   |  | 6.3        |