While ISDN has nothing to do with ANSI-41, it is added to this discussion because together, SS7 and ISDN provide the end-to-end signaling required for delivery of enhanced services to users.

• 然而 isdn 却和 ANSI-41 无关，之所以加入这部分讨论，是因为 SS7 和 isdn 都可以提供向用户提供增强服务所需的端到端信令。