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SL 417-2016 via email in please email coc@codeofchina.com for quotation
YD/T 1522.31-2009 Technical Requirements for Session Initiation Protocol Part 3 Interworking between ISUP and SIP-Supplement 1 via email in VALID please email coc@codeofchina.com for quotation
YD/T 1522.4-2009 Technical Requirements for Session Initiation Protocol Part 4 SIPs Applications about call control Based on Softswitch Network via email in VALID please email coc@codeofchina.com for quotation
YD/T 1127-2001 Technical Requiremnet of Interworking between No.7 Signalling and IP 495 (USD) via email in 1-5 business day VALID
YD/T 913-1997 Digital subscriber signalling system No.1(DSS1)-typical DSS1 service indicator codings for ISDN telecommunications services 765 (USD) via email in 1-8 business day VALID
YD/T 1296-2003 Technical specification for public IP voice switch 390 (USD) via email in 1-3 business day VALID
YD/T 887-1997 150 (USD) via email in 1-3 business day
YD/T 1663-2007 Testing Methods for Bearer Independent Call Control via email in VALID please email coc@codeofchina.com for quotation
YD/T 1309-2004 Bearer independent call bearer control specification 1575 (USD) via email in 1-10 business day VALID
YDC 048-2007 Overall Technical Specification for ENUM via email in VALID please email coc@codeofchina.com for quotation
GB 3379-1982 Interoffice direct signalling system for telephone automatic switching network 375 (USD) via email in 1-3 business day ABOLISHED
YD/T 1304-2004 Test specification for national No.7 signalling system--Message Transfer Part (MTP)and Telephone User Part (TUP) 4800 (USD) via email in 1-10 business day VALID
YD/T 1250-2003 Test method for access network——passive optical netwrok based on ATM (A-PON) 690 (USD) via email in 1-5 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 via email in ABOLISHED please email coc@codeofchina.com for quotation
YD/T 1662-2007 Testing Methods for National No.7 Signalling System——GSM Mobile Telephone User Part (MTUP) via email in VALID please email coc@codeofchina.com for quotation
GB 3380-1982 Ringing and tone for telephone automatic switching network via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
YD/T 1936-2009 Technical Requirements for Session Description Protocol via email in VALID please email coc@codeofchina.com for quotation
YD/T 1254-2003 Access network technical specification-TDD based Ethernet Digital Subscriber Line system (TDD-EDSL):variable length frame transmission mode 630 (USD) via email in 1-5 business day VALID
YD/T 1919-2009 Test Methods for V5.2 User Adaptation Layer via email in VALID please email coc@codeofchina.com for quotation
YD/T 1193.1-2002 Bearer independent call control specification-Part 1:functional of BICC 165 (USD) via email in 1-3 business day VALID
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