SIP相关内容

1. SIp

ZDNetchina SIP简介（网络频道 - >协议基础->SIP协议)

http://net.zdnet.com.cn/network_security_zone/2008/0103/696053.shtml

2. UDP

 

3.加密tls

 

4.tls, tcP

 

5. dtls

 

6. srtp

 

 

7. rfc

 

8.pbx

9. rtp

10. pstn

11.Codec

12. RTP

详细讲解：

1）.[SIP]:a portal for promoting standardization knowledge

 http://www.tech-invite.com/Ti-sip-archi.html

2). http://www.sipknowledge.com/sip_elearn_demo.htm