YD/T 1918-2009 ISDN信令与IP互通用户适配层（IUA）测试方法

YD/T 1918-2009 YD/T 1918-2009 ISDN signaling and IP interworking user adaptation layer (IUA) testing method. Translation: YD/T 1918-2009 ISDN signaling and IP interworking user adaptation layer (IUA) test method. Note: YD/T stands for "Yellow River Delta Telecommunications Standard". ISDN stands for Integrated Services Digital Network. IUA refers to the interface between ISDN signaling and IP communication, which is commonly used in network test and measurement