Code of China Chinese Standard Classification Professional Classification ICS Classification Latest
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YD/T 1918-2009 Test Methods for the Adaptation Layer of ISDN Signalling Interworking with IP 750.0 via email in 1~3 business day valid
GB 3376-1982 Inband pulsing single frequency line signalling system for telephone automatic switching network 90.0 via email in 1~3 business day valid
GB 3380-1982 Ringing and tone for telephone automatic switching network 90.0 via email in 1~3 business day valid
GB/T 28502-2012 Technical requirement of interworking between No.7 signalling and IP 600.0 via email in 1~3 business day valid
YD/T 1938.2-2009 Test method for Session Initiation Protocol (SIP) Part 2:SIPs Applications about Call Control Basedon Softswitch Network 780.0 via email in 1~3 business day valid
YDC 048-2007 Overall Technical Specification for ENUM 750.0 via email in 1~3 business day valid
YD/T 1936-2009 Technical Requirements for Session Description Protocol 480.0 via email in 1~3 business day valid
GB/T 14401-1993 between mobile station and base station and mobile services switching centre in public land mobile communication network at 450MHz band 450.0 via email in 1~3 business day valid
YD/T 1684-2007 Technical Requirements and Testing Methods for the Billing of the Digital Cellular Mobile Telecommunication Network Point to Point Short Message Service 270.0 via email in 1~3 business day abolished
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