Description: China Telecom SIP specification of three parts, as well as China Telecom SIP supplementary and revision of norms, it is a comprehensive
File list (Check if you may need any files):
中国电信SIP规范第一部分_总体要求.pdf
中国电信SIP规范第三部分（信令流程）.pdf
中国电信SIP规范第二部分(协议细则).pdf
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