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, 2008



|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|--------------------------------------------------- |  | ------ | - |  | ------ |  | ------ |  | ------ | - |  | ------ | -
|CONCEPT                                             |  | 2008   |   |  | 2007   |  | 2006   |  | 2005   |   |  | 2004   |  
|Mexican FRS:                                        |  |        |   |  |        |  |        |  |        |   |  |        |  
|Income from continuing operations before income tax |  | 29,769 |   |  | 40,508 |  | 39,890 |  | 38,468 |   |  | 41,306 |  
|Less:                                               |  |        |   |  |        |  |        |  |        |   |  |        |  
|Equity interest in net income (loss) of affiliates  |  | (62    | ) |  | 17     |  | 9      |  | (20    | ) |  | (120   | )
|Plus:                                               |  |        |   |  |        |  |        |  |        |   |  |        |  
|Fixed charges:                                      |  |        |   |  |        |  |        |  |        |   |  |        |  
|Interest expense                                    |  | 7,652  |   |  | 6,615  |  | 6,952  |  | 6,409  |   |  | 5,708  |  
|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|Earnings under Mexican FRS                          |  | 37,483 |   |  | 47,106 |  | 46,833 |  | 44,897 |   |  | 47,134 |  
|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|                                                    |  |        |   |  |       
|U.S. GAAP:                                          |  |        |   |  |        |  |        |  |        |   |  |        |  
|Income from continuing operations before income tax |  | 29,530 |   |  | 39,166 |  | 39,355 |  | 37,252 |   |  | 40,274 |  
|Less:                                               |  |        |   |  |        |  |        |  |        |   |  |        |  
|Equity interest in net income (loss) of affiliates  |  | (62    | ) |  | 17     |  | 9      |  | (20    | ) |  | (120   | )
|Plus:                                               |  |        |   |  |        |  |        |  |        |   |  |        |  
|Fixed charges:                                      |  |        |   |  |        |  |        |  |        |   |  |        |  
|Interest expense                                    |  | 7,652  |   |  | 6,615  |  | 6,952  |  | 6,563  |   |  | 5,265  |  
|Interest capitalized                                |  | 0      |   |  | 0      |  | 0      |  | 11     |   |  | 10     |  
|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|Total                                               |  | 7,652  |   |  | 6,615  |  | 6,952  |  | 6,574  |   |  | 5,275  |  
|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|Plus:                                               |  |        |   |  |        |  |        |  |        |   |  |        |  
|Depreciation of capitalized interest                |  | 293    |   |  | 342    |  | 477    |  | 612    |   |  | 625    |  
|Less:                                               |  |        |   |  |        |  |        |  |        |   |  |        |  
|Interest capitalized                                |  | 0      |   |  | 0      |  | 0      |  | 11     |   |  | 10     |  
|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|Earnings under U.S. GAAP                            |  | 37,537 |   |  | 46,106 |  | 46,775 |  | 44,447 |   |  | 46,284 |  
|                                                    |  |        |   |  |        |  |        |  |        |   |  |        |  
|                                                    |  |        |   |  |       
|RATIOS OF EARNINGS TO FIXED CHARGES:                |  |        |   |  |        |  |        |  |        |   |  |        |  
|Mexican FRS                                         |  | 4.9    |   |  | 7.1    |  | 6.7    |  | 7.0    |   |  | 8.3    |  
|U.S. GAAP                                           |  | 4.9    |   |  | 7.0    |  | 6.7    |  | 6.8    |   |  | 8.8    |