National Communication Act No. 24 CHAPTER VI POSTAL SERVICES 39. Right to Provide Postal Services. 40. Postage Stamps and Letter Boxes. 41. Liability for Postal Article. 42. Opening of Postal Article. 43. Interception of Postal Article. 44. Article or Material Injurious to Persons. 45. Prohibited Materials. 46. Evidence of Return of Postal Articles. 47. Postal Financial Services. CHAPTER VII INTERCONNECTION, INFRASTRUCTURE SHARING AND ANTI-COMPETITIVE PRACTICES 48. Interconnection between Networks. 49. Obligations of the Dominant Operator. 50. Bases and Principles of Interconnection. 51. Obligations of Interconnection Parties. 52. Withdrawal or Cessation of Interconnection Services. 53. Infrastructure Sharing. 54. Anti-Competitive Practice. CHAPTER VIII MANAGEMENT AND ALLOCATION OF FREQUENCY AND SPECTRUM 55. Frequency and Spectrum Control. 56. Licensing, Renewal and Cancellation. 3