H 323 Intelligent monitoring and recording system implementation

客製化H. 323協定之智慧型網路電話監控與錄音系統 Intelligent monitoring and recording system implementation for Customized H. 323 -based

Outline n n n Motivation and Goal Background Implementation of System ¨ System Environment

Background n Standard H. 323 network structure ¨ H. 323 protocol stack ¨ H.

H. 323 Related Protocol n RAS (Connect with Gatekeeper) n H. 225/Q. 931 (Call

RAS(Registration, Admission and Status) n n n 閘道管理員搜尋（Gatekeeper Discovery）端點註冊（Endpoint Registration）端點定址（Endpoint Location）允入控制（Admission

RRQ: Registration Request RCF: Registration Confirmation ARQ: Admission Request ACF: Admission Confirmation DRQ: Disconnect

H. 225/Q. 931 n n H. 225/Q. 931 call signaling is used to establish

H. 245 function definition Function Note Master-Slave Determination Determines which terminal is the master.

RTP n n P : Padding Ex : Extension CSRC : contributing source identifiers

RTP Payload Type RTP PT Name Type Clock rate (Hz) Audio channels References 0

Customized H. 323 n What is customized H. 323 ? ¨ n 部份的H. 323終端設備製造商為了賺取更高的利潤而藉由更改H.

5 -bytes Customized Signal 話機按鍵 Hook鍵壓下(On-hook) Hook鍵彈起(Off-hook) DROP Conference Transfer Hold 撥號數字 1~0 ＊字號

19 -bytes Customized Signal 內線通話外線通話 19 38 11 20 AE E 3 50

Customized H. 323 Call Flow n The difference between standard and customized H. 323

The difference between standard and customized H. 323 call flow 24

Implementation of System n System Environment of Network n System Architecture n Design flow

Log n 格式: [Time] [Type] [Description] 33

Slides: 40

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客製化H. 323協定之智慧型網路電話監控與錄音系統 Intelligent monitoring and recording system implementation for Customized H. 323 -based Internet phone 研究生 : 蔡家瑞指導教授 : 柯開維 Date： 2009/07/23 1

Outline n n n Motivation and Goal Background Implementation of System ¨ System Environment of Network ¨ System Architecture ¨ Design flow chart ¨ Audio Recording n n Conclusion and Future Works DEMO 2

Background n Standard H. 323 network structure ¨ H. 323 protocol stack ¨ H. 323 call flow chart ¨ H. 323 related protocol ¨ n Customized H. 323 Customized Signal ¨ Customized H. 323 Call Flow ¨ 5

H. 323 Network Structure 7

H. 323 Protocol Stack 8

Standard H. 323 Call Flow Chart 9

H. 323 Related Protocol n RAS (Connect with Gatekeeper) n H. 225/Q. 931 (Call Control) n H. 245 (Media Control) n RTP (Media Transport) 10

RAS(Registration, Admission and Status) n n n 閘道管理員搜尋（Gatekeeper Discovery）端點註冊（Endpoint Registration）端點定址（Endpoint Location）允入控制（Admission Control）頻寬管理（Bandwidth Management）狀態查詢、脫離以及閘道資源指示（Status, Disengage and Resource Indicate） 11

RRQ: Registration Request RCF: Registration Confirmation ARQ: Admission Request ACF: Admission Confirmation DRQ: Disconnect Request DCF: Disconnect Confirmation T RRQ RCF GK (endpoint is registered) ARQ ACF (endpoint may place call) DRQ (call has terminated) DCF Symbol Key: T GK Terminal Gatekeeper 12

H. 225/Q. 931 n n H. 225/Q. 931 call signaling is used to establish a H. 323 call. Q. 931 header Structure Name Protocol Discriminator Length(Octets) 1 Note Always 0 x 08 Call Reference 1, 2, or 3 Message Type 2 See Appendix various see Appendix IEs (Information Elements) The call reference field 13

H. 245 function definition Function Note Master-Slave Determination Determines which terminal is the master. Capability Exchange Contains information about a terminal's capability. Open and Close Transport of audio and data of Logical information. Channels Close the H. 245 Indicates the end of the Control Channel H. 245 session. 15

RTP n n P : Padding Ex : Extension CSRC : contributing source identifiers count M : Mark 16

RTP Payload Type RTP PT Name Type Clock rate (Hz) Audio channels References 0 PCMU Audio 8000 1 RFC 3551 2 G 721 Audio 8000 1 RFC 3551 3 GSM Audio 8000 1 RFC 3551 8 PCMA Audio 8000 1 RFC 3551 9 G 722 Audio 8000 1 RFC 3551 15 G 728 Audio 8000 1 RFC 3551 18 G 729 Audio 8000 1 17

Customized H. 323 n What is customized H. 323 ? ¨ n 部份的H. 323終端設備製造商為了賺取更高的利潤而藉由更改H. 323 的標準, 使他們的產品差異化, 藉此提供Standard H. 323所沒有的額外功能或是使自家產品與其它廠牌產品無法相容 What’s difference about standard and customized H. 323? Call Signal ¨ Call Flow ¨ 18

5 -bytes Customized Signal 話機按鍵 Hook鍵壓下(On-hook) Hook鍵彈起(Off-hook) DROP Conference Transfer Hold 撥號數字 1~0 ＊字號 #字號訊息 05 38 00 80 01 05 38 00 80 02 05 38 00 60 03 05 38 00 60 04 05 38 00 60 05 05 38 00 7 F 01~0 A 05 38 00 7 F 0 B 05 38 00 7 F 0 C 8 -bytes Customized Signal 描述訊息話機於號碼撥完時收到 08 38 11 20 A 3 83 04 42 受話端收到呼叫時 08 38 11 20 A 2 80 05 40 受話端接受呼叫時由發話端收到 08 38 11 20 A 3 80 18 07 21

19 -bytes Customized Signal 內線通話外線通話 19 38 11 20 AE E 3 50 20 53 6 F 66 74 50 68 6 F 6 E 65 31 20 (softphone 1) 13 38 11 20 AE E 3 55 54 53 49 44 45 20 43 41 4 C 4 C 20 20 (outsidecall) 25 -bytes Customized Signal 分機號碼通話結束訊號 19 38 11 20 AE E 3 1 B 5 B 00 3 B 1 D 48 20 XX XX 20 20 A 5 E 3 20 20 1 B 45 19 38 11 20 A 2 80 06 AD E 3 1 B 5 B 00 3 B 00 48 16 5 B 02 4 B 1 B 45 A 3 80 2 F 0 E 22

Customized H. 323 Call Flow n The difference between standard and customized H. 323 call flow n P 2 P call flow chart ＊Call Transfer flow chart(see Appendix) ＊Conference call flow chart(see Appendix) 23

The difference between standard and customized H. 323 call flow 24

P 2 P Call flow Detail 26

P 2 P Call flow Detail (Cont. ) 27

Implementation of System n System Environment of Network n System Architecture n Design flow chart ¨ User Interface ¨ Log n Audio Recording 28

System Environment of Network 29

System Architecture 30

Design flow chart 31

User Interface 32

Log n 格式: [Time] [Type] [Description] 33

Audio Recording n RTP封包處理 n 音訊還原解碼 34