介绍了公用电信网间互联的概念,讨论了当前公用电信网互联存在的安全隐患。针对本地网存在的不安全因素,提出了电信网间互联安全的防范措施。 Introduces the concept of public telecommunication internetworking, and discusses the security risks existing in current public telecommunication network interconnection. Aiming at the unsafe factors existing in the local area network, this paper puts forward the countermeasures to prevent the interconnection between telecom networks.