SIP???SDP??

1
?2??????????????
2

• ????
• ???????????????
• SIP???SDP??
• H.248??
• BICC??
• ??????SIGTRAN

3
???????????????
4
???????????????

• IP??
• IP???????
• ?????????????????????????IP???,???????????

5
???????????????

• UDP??
• ???????????????IP??,????????????????????????
• ???????
• ???????????,???NGN????????????????????????????????
  ??????????

6
???????????????

• RTP??
• ??????????????????????,IETF?????????(RTP)
• RTP??????????????RTP???RTCP??
• RTP??????????,????????
• RTCP?????????????????????,??????????????????
• ??????UDP?????RTP???,??RTP????1????????????RTCP???
  ?

7
???????????????

• RTP????

8
???????????????

• RTP????

9
???????????????

• ????
• PCM(G.711??)
• ????64kb/s,?????????????
• G.729??
• ????8kbit/s
• G.723.1??
• ?????????? 5.3kbit/s?6.3kbit/s
• ?PSTN?????????????????

• ?????? AMR??
• ??8???12.2 Kbit/s,10.2Kbit/s,7.95Kbit/s,7.40Kbit/
  s,6.70Kbit/s,5.90Kbit/s,5.15 Kbit/s?4.75Kbit/s
• ?????????

10
???????????????

• ??????IP??????????
• ????????IP???????????

11
???????????????

• ??????????????????????????,G.729?????20ms????,???
  ???50????,????????12???RTP???8???UDP???20???IP??,?
  ?1?G.729????????
• (20812)8508000 24000bit/s24kbit/s
• ????Ethernet??????,Ethernet???304bit
  (38byte)???1?G.729????????
  (2081238)850800039200bit/s39.2kbit/s
• ????????????,???????????
• ????????,???????????????????????????

12
SIP???SDP??

• ??
• SIP(Session Initiation Protocal)????????,??Interne
  t?????IETF?1999?????????IP???,????Internet????????
  ????,???????????????????

13
SIP???SDP??

• SIP???????
• ??????????????????
• ??????????????????
• ????????????????
• ????????????????
• ????????????????
• SIP???????????????????????????????SIP?????SIP?????
  ????SIP??????

14
SIP???SDP??

• SIP???????

15
SIP???SDP??

• ??SIP????????????

16
SIP???SDP??

• ??????SDP

• SDP??????????????????????????????? ?
• SDP????????,?????SIP?H.248??????
• SDP??????

v0 obell 53655765 2353687637 IN IP4
128.3.4.5 cIN IP4 169.130.12.5 maudio 3456
RTP/AVP 0 3 4 5
17
SIP???SDP??

• SIP????

• INVITE sipbob_at_shanghai.com SIP/2.0
• Via SIP/2.0/UDP 217.19.97.15060
• To sipbob_at_shanghai.com
• From siptom_at_ guangzhou.com tag2089095865
• Call-ID 1039412186_at_217.19.97.1
• CSeq 1 Invite
• Max-Forwards70
• Content-Type application/sdp
• Content-Length 271
• Contact ltsiptom_at_ 217.19.97.15060transportudpgt
  
• v0
• otom 13908157962 139089745962 IN IP4 217.19.97.1
• sn
• cIN IP4 217.19.97.1
• t0 0
• maudio 50000 RTP/AVP 8
• artpmap8 PCMA/8000
• aptime 10

18
SIP???SDP??

• SIP??????SoftX3000????

• ????

IP??10.77.226.121 ????8882100 ????8882100_at_10.77
.226.41
IP??10.77.226.221 ????8882101 ????8882101_at_10.77
.226.41
19
SIP???SDP??

• ??
• ??

20
H.248??

• ??
• H.248/Megaco??????????????????????????????????????
  ???????,??????????????,????????????
• H.248??????TCP?UDP?SCTP???????????
• H.248????????????,?????????????????

21
H.248??

• ???????
• ??????(Termination)????(Context)
• ??
• ???MG????????,??????/?????????????
• ???????????????????
• ???????,???????MG??????(?????????),???????????????
  ????????????????
• ???????????(Termination ID),?????????,?????????

22
H.248??

• ???
• ?????????????,????????,???????????????????
• ?????
• ????? ???????,??????????????????
• ????????????????????
• ????????MG????????????
• ???????????????????,MG?????????
• ?????????????????H.248?????

23
H.248??

• ??????

24
H.248???????
10.54.250.187 2944
???
H.248
10.54.250.43 2944
10.54.250.18 2944
????1
????2
18300 G.723
18296 G.723
6540100
A0 A100000034
A100000035 A1
IP????
Context286
Context287
UserA
UserB
25
(No Transcript)
26
BICC??

• ?BICC?????????

??H.248?? ?????? ??IPBCP??
??BICC??
27
BICC??

• BICC????

• ??????????????????,??????????????????????
• BICC??????????????????????????????????????????????
  ????
• BICC????N-ISUP??,??ISUP??????,???APM (Application
  Transport Mechanism) ????BICC?????????,??????????P
  STN/ISDN???
• BICC?????????????3G?R4?????

28
BICC??
BICC????????????
29
BICC??

• BICC ????

30
(No Transcript)
31
??????SIGTRAN

• SIGTRAN ???

• SIGTRAN?????IP?????????????,??NGN???????????

SoftX3000
IP?
SG
TG
No.7???
32
??????SIGTRAN

• SIGTRAN????????(SCTP)????????(UAL)?????????????

Q.921
33
??????SIGTRAN

• ???????SCTP

• UDP?TCP????
• UDP??????????????
• TCP???????????????????????????????????????????
• SCTP?????????,??TCP????????
• ?????TSN?SACK
• ?????????U???0,????,????
• ?????????????????
• ??????????????????????,???
• ????INIT,INIT ACK

34
??????SIGTRAN

• SCTP???
• ????????????????????????????U???0,????,????
• ?????MTU????????????
• ?????????????SCTP?????
• ????????????????
• ??SCTP???????????????????????????????
• ????????????????????????

35
??????SIGTRAN

• SCTP???
• SCTP?????SCTP?????????????????????SCTP????????????
  ?

SCTP?