Code of China Chinese Standard Classification Professional Classification ICS Classification Latest
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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
SL 417-2007 Automatic telephone number for telephone network of water resources 180.0 via email in 1~3 business day abolished
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
GB/T 15838-2008 Test methods for the performances of switching equipment clocks in digital network 420.0 via email in 1~5 business day valid
YD/T 1938.1-2009 Test method for Session Initiation Protocol (SIP) Part 1:Basic Session Initiation Protocol 4470.0 via email in 1~3 business day valid
GB/T 5444-1985 The test methods for the technical specifications of subscriber line signalling for automatic telephone switching network 90.0 via email in 1~3 business day valid
YD/T 913-1997 Digital subscriber signalling system No.1(DSS1)-typical DSS1 service indicator codings for ISDN telecommunications services 630.0 via email in 1~3 business day valid
GB/T 28524-2012 Media Gateway Control Protocol(MGCP) 1260.0 via email in 1~3 business day valid
YD/T 1662-2007 Testing Methods for National No.7 Signalling System——GSM Mobile Telephone User Part (MTUP) 1050.0 via email in 1~3 business day valid
YD/T 1309-2004 Bearer independent call bearer control specification 1500.0 via email in 1~3 business day valid
YD/T 928-1997 Technical specification for ISDN PABXs 255.0 via email in 1~3 business day valid
YD/T 1296-2003 Technical specification for public IP voice switch 390.0 via email in 1~5 business day valid
GB 3971.2-1983 Interoffice junction digital line signalling system for telephone automatic switching network 150.0 via email in 1~3 business day valid
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
GA 330-2001 Transmission technology protocol of alarm for 351 MHz 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
YD/T 1936-2009 Technical Requirements for Session Description Protocol 480.0 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
GB/T 28506-2012 Technical specification for national No.7 signalling system—GSM mobile telephone user part (MTUP) 990.0 via email in 1~3 business day valid
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