电信服务合同的履行不仅在当事人之间发生效力,还常常要涉及第三人(被叫用户),甚至发生第三人介入合同的履行过程。电信服务的全程全网和互联互通等特点,使得电信服务变得多样和复杂。主要从语音服务和短信服务两种电信业务中探讨电信服务合同对第三人的效力问题。 The performance of telecommunication service contracts not only has the effect of the parties, but also often involves the third party (called party), and even the third party intervened in the contract. The whole network of telecommunications services and interoperability and other characteristics, making telecommunications services become diverse and complex. Mainly from the voice service and short message service two kinds of telecommunications business to discuss the service contract of telecommunication to third party’s effectiveness question.