?? ? : RTP

1
?? ? RTP

• ????
• ??????RTP??????????
• ???RTP?RTCP??????????
• ????

IP Network
SIP Signaling
RTP Media Stream
??cclRTP(?????),??RTP??????,?????????
2
??cclRTP(????????,??object code)

• ??RTP??????(cclRtp.h cclRtp.c rtp.h rtp.c)
• ????????(WavInOut.h WavInOut.c)
• ?RTP?????????,???????RTP??(SimRTPDlg.h
  SimRTPDlg.c)

3
???? (1/3)

• ????????????????????????IP
• CSimRTPDlgCSimRTPDlg???cclRTPStartup(2)
• ?RTP????????
• ????channel??2
• RTPOpenPort()??RTP port

4
???? (2/3)

• void CSimRTPDlgOnOK()??WavIO??
• ??RTPPeerConnect(ConnectIP,ConnectPort)?RTP???????
  
• IP?ConnectIP
• port?ConnectPort(?????9000)
• ?????IO,???????RTP

5
???? (3/3)

• ???????

????????
????IP
?????? ?Exit??
6
????

• ??? CSimRTPDlgCSimRTPDlg
• ???cclRTP?WavIOObj
• ??RTP port?
• ???????,?????OnOK function
• ???WavIO
• ???RTP??,???target ip?port?
• ???target ip?port??
• ?????buffer??
• ???WavIO,???????

7
??? SIP User Mobility

• ????
• ??Location Server?Redirect Server???,????SIP??????
  ???
• ????
• (1)???? Location Server ??? SIP REGISTER ,??
• ?? REGISTER ? Contact header ??URI???? ?

8

• (2)???? Redirect Server ??? SIP INVITE Requests ,
  
• ???INVITE Request ?? SIP 302 Moved
  Temporarily
• Response,??????????? URI ?? Contact
• header??

9
Sample 1/5

• CCL SIP User Agent

(1)Preference (????)
10
Sample 2/5
??(????Proxy)
??Registar?IP,Port
11
Sample 3/5
???????
??????Port
12
Sample 4/5
Jay_at_ntu.edu.tw
REGISTER ToJay_at_hinet.net ContactJay_at_ntu.edu.tw
200 OK
13
Sample 5/5
Jay_at_ntu.edu.tw
Flora_at_nctu.edu.tw
(1)SIPJay_at_hinet.net
(2)SIPJay_at_ntu.edu.tw
(3)SIPJay_at_ntu.edu.tw
SIPJay_at_hinet.net
14
??????

• Location Server, Redirect Server??????????,??Java
  Socket, WinSock, Perl, Berkely Socket
• ??????

?Location Information ??????????
??????, ????Parse
??INVITE??, ????Parse
??302 Move Temporarily ? SIP Message
15
??? MGCP

• ????
• ?????MGCP???????????,??MGCP??????,???Call
  Agent?????,????????????
• ????

?? CA ??????
CA
SS7
SG
MGCP
TGW
RGW
CO
PSTN
RTP
16
???? (1/4)
??RGW
??CA
????????
17
???? (2/4)
???CA
????
???RGW
???Endpoint
18
???? (3/4)
????????
19
???? (4/4)
CA????????????
RGW????????? ????CA????
??????
20
CA?? (1/3)
???????port
???????IP
21
CA?? (2/3)

• ????RGW?????

?CA?????IP
CA???port
22
CA?? (3/3)
RGW??IP
RGW??port
CA?????????
???id
23
RGW??(?Voice Support)
??RGW?????
??CA?????
?????????????????(?????RGW???Domain Name?????port)
????RGW?????ID(endpointID)???
24
RGW??(?Voice Support)
??RGW?????
??CA?????
?????????????????(?????RGW???Domain Name?????port)
???RGW?????????????
25
????????
??????????? ???? ??endpointID ??
??????(hd??)
??????(hu??)
????????
??????(??????)
26
???????(1/4)

• ????? ????? (???????????)

??????? ??????
?? message flow
??CA?finite state machine
27
???????(2/4)

• MGCP?????????

28
???????(3/4)

• ????????? (?????????)

29
???????(4/4)

• ????? Call Agent ????
• (A),(B)?? call agent simulator, (B)?mgcLoop?????
  (C)RGW ?MGCP Msg, ????(A)???????,???????,??caller?
  callee?????,?????????,????Ack????MGCP?????caller,c
  allee????????????????(A)???,?CASim.cpp??????

30
?? ???(Follow-me Service)