Beijing University of Posts and Telecommunications and Soft Switch stresses, pdf format, it is true that we used to study the common

Packet : 101259355softswitching3.rar filelist
第十三讲 H_323协议(下).pdf
第十一讲 H.248协议（一）.pdf
第十二讲 SIP协议.pdf
第十三讲 H_323协议(上).pdf

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