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1、SIP在IMS中的应用,1,内容介绍,注册流程 呼叫流程 基本补充业务流程,2,注册流程相关概念,为什么要注册用户使用IMPU（SIP URI）通信建立用户当前的IP与其IMPU的对应关系掌握用户当前的位置信息及业务能力注册过程的鉴权与认证保证了网络的安全性归属域和拜访域归属域：就是用户的签约数据所在的运营商。拜访域：就是从归属域之外的其他运营商接入，这个其他运营商统称为拜访域。IMS网络中，用户无论在归属域还是拜访域，其注册流程是相同的,3,注册不是目的，仅完成安全性和服务呼叫两项工作。,归属和拜访网络中的初次注册请求,归属网络,Authenticationset,401,S-CSCF,HS
2、S,S-CSCF assignment,Register,Register,401,401,P-CSCF,I-CSCF,归属网络,Authenticationset,200OK,S-CSCF,HSS,S-CSCF assignment,Register,Register,200OK,200OK,P-CSCF,I-CSCF,拜访网络,4,初始注册流程,5,6,PCSCF接收到UE的注册消息（1）,REGISTER sip:SIP/2.0Via:SIP/2.0/UDP 154.24.77.32:10009;branch=z9hG4bK96ed347b4f61685db5Call-ID:96ed34
3、7b4f61685db5e6ec273e7e0400From:;tag=96ed347b4f61685db5To:sip:Impu-FIX-46001475731-/需要注册的IMPU（PUI）CSeq:18081 REGISTERMax-Forwards:70Contact:;expires=3600/注册有效期Authorization:Digest username=Impi-46001475731-,realm=,uri=sip:,algorithm=MD5Supported:pathContent-Length:0,PVI信息,P-CSCF发出的注册消息(2),REGISTER si
4、p:SIP/2.0Via:SIP/2.0/UDP 154.24.10.102:5060;branch=z9hG4bKc67a9n9db7,/P-CSCF的地址 SIP/2.0/UDP 154.24.77.33:14657;branch=z9hG4bK44618dd96cCall-ID:96ed347b4f61685db5e6ec273e7e0400From:;tag=96ed347b4f61685db5e6ec273e7e0400To:CSeq:18081 REGISTERMax-Forwards:69Supported:pathContact:;expires=3600Path:/P-CSC
5、F的主机名P-Visited-Network-ID:“/拜访网络标识P-Charging-Vector:icid-value=“78f32f819e10cf148de3d7af70c5142e.3483116445.4.11“/产生的计费标识Authorization:Digest username=Impi-FIX-46001475731-,realm=,uri=sip:,algorithm=MD5P-Access-Network-Info:IEEE-802.11;location-info=154.24.77.32Require:path,7,I-CSCF发出的注册消息(3),REGIST
6、ER sip:;transport=udp;RegState=2 SIP/2.0/S-CSCF的地址Via:SIP/2.0/UDP 154.24.10.103:5060;branch=z9hG4bKl68tbsdi7clw,/I-CSCF的地址 SIP/2.0/UDP 154.24.10.102:5060;branch=z9hG4bKc67a9n9db7vc,SIP/2.0/UDP 154.24.77.33:14657;branch=z9hG4bK44618dd96c57Call-ID:96ed347b4f61685db5e6ec273e7e0400From:;tag=96ed347b4f61
7、68To:CSeq:18081 REGISTERAuthorization:Digest username=Impi-FIX-46001475731-,realm=,uri=sip:,algorithm=MD5Contact:;expires=3600Max-Forwards:68Require:pathSupported:pathUser-Agent:Fixed-SipPath:P-Visited-Network-ID:P-Access-Network-Info:IEEE-802.11;location-info=154.24.77.32P-Charging-Vector:icid-valu
8、e=78f32f819e10cf148de3d7af70c5142e.3484458669.1.11,8,S-CSCF发出的401鉴权挑战消息（4）,SIP/2.0 401 UnauthorizedVia:SIP/2.0/UDP 154.24.10.103:5060;branch=z9hG4bK7n8v9anvl8n7nwsv4ll4c689v;Role=1;Dpt=75e6_16,SIP/2.0/UDP 154.24.10.102:5060;branch=z9hG4bK7dbisi7cdvbwvdb8cab7wt899;Role=1;Dpt=75e2_16,SIP/2.0/UDP 154.2
9、4.77.32:10009;branch=z9hG4bK96ed347b4f61685db5e6ec273e7e0400;rport=10009Call-ID:96ed347b4f61685db5e6ec273e7e0400From:;tag=96ed347b4f61685db5e6ec273e7e0400To:;tag=7dw46ds6CSeq:18081 REGISTERWWW-Authenticate:Digest realm=,nonce=+CPa2HIGD0dAPSh6AEpeug=,algorithm=MD5,qop=auth“/鉴权相关信息Content-Length:0,S-C
10、SCF 发出的200OK消息,SIP/2.0 200 OKVia:SIP/2.0/UDP 154.24.10.103:5060;branch=z9hG4bKi49lidtt9wdcbs6sbil8adcd4;Role=1;Dpt=75e6_16,SIP/2.0/UDP 154.24.10.102:5060;branch=z9hG4bKdcw6a4889wba8dl4d964dcww8;Role=1;Dpt=75e2_16,SIP/2.0/UDP 154.24.77.33:14657;branch=z9hG4bKe2b45e4668f2e659fb34d1f498a0cecb;rport=146
11、57Call-ID:96ed347b4f61685db5e6ec273e7e0400From:;tag=b8486c648d3b808a7d6ba735dcb4a1e9To:;tag=9d9ws6wcCSeq:18082 REGISTERService-Route:sip:;lr/S-CSCF地址P-Associated-URI:,/隐式注册集 Contact:;q=1;expires=7200/用户注册的联系地址Path:Authentication-Info:nextnonce=“N7WoYnSgNP17M81tU2ZmrA=“/下一次鉴权的nonce值Content-Length:0,要
12、点：Service-Route:SCSCF的地址，用于呼叫时主叫PCSCF寻找SCSCF使用 P-Associated-URI:携带隐式注册集列表，表示此次注册上的用户列表 Authentication-Info:nextnonce机制打开时，携带下一次鉴权的随机值 nonce Contact:用户注册上的联系地址列表,10,P-CSCF 发出的200OK消息,SIP/2.0 200 OKVia:SIP/2.0/UDP 154.24.77.32:10009;branch=z9hG4bKfdcbb1b7376f47290d8743b448d6028d;rport=10009Call-ID:96e
13、d347b4f61685db5e6ec273e7e0400From:;tag=b8486c648d3b808a7d6ba735dcb4a1e9To:;tag=9d9ws6wcCSeq:18082 REGISTERP-Associated-URI:,Authentication-Info:nextnonce=N7WoYnSgNP17M81tU2ZmrA=Contact:;q=1;expires=3600Accept-Resource-Priority:wps.2Content-Length:0,要点：VIA：将自己的那一跳地址从VIA头域中删除 Service-Route：在发往终端时将其删除
14、Path：在发往终端时将其删除 注册成功PCSCF保存的信息：Contact地址、用户公有身份标识、用户私有身份标识、用户隐式注册集、Service-Route头域,11,S-CSCF发出的第三方注册消息,REGISTER sip:154.24.114.118:6801 SIP/2.0/三方注册服务器地址Via:SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bK9bwsln86tdwvlwbtsdaw6ai6s;Role=3;Dpt=75e4_16;TRC=a00-ffffffff/S-CSCF的地址Call-ID:iwaa9d4bv879wsc7btw
15、s4lit86t66bcs154.24.10.104From:;tag=s9sb98b4/S-CSCF的域名To:/三方注册的用户身份CSeq:1 REGISTERContact:;expires=7200/三方注册的联系地址Expires:7200/三方注册时长P-Charging-Vector:icid-value=78f32f819e10cf148de3d7af70c5142e.3483116445.4.11P-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.
16、77.33P-Visited-Network-ID:Resource-Priority:wps.2Max-Forwards:70Supported:100relContent-Length:0,要点：Request-URI：AS的地址 VIA：SCSCF将自己添加进去，用于响应路由 From:SCSCF的主机名 To:标识 注册用户的公有身份 Contact:SCSCF的联系地址 Expires:注册时长,12,知识回顾,IMS用户注册流程涉及到哪些IMS网元？,13,IMS用户注册的目的是什么？,内容介绍,注册流程 呼叫流程 基本补充业务流程,14,Page15,Invite,IMS用户之间
17、的基本会话建立过程,Invite,Invite,Invite,Invite,Invite,183,183,183,183,183,183,S-CSCF-A,HSS-A,P-CSCF-A,I-CSCF-A,I-CSCF-B,HSS-B,S-CSCF-B,P-CSCF-B,DNS/ENUM,主叫侧,被叫侧,业务触发会话流程,S-CSCF1,I-CSCF2,P-CSCF2,P-CSCF1,S-CSCF2,1.INVITE,HSS,AS1,AS2,190.1.10.1,190.1.10.3,191.1.10.2,191.1.10.3,191.1.10.1,189.1.1.111,189.1.10.20
18、1,190.1.30.1,191.1.30.1,2.INVITE,3.INVITE,4.INVITE,5.INVITE,6.INVITE,7.INVITE,7.INVITE,7.INVITE,8.INVITE,9.INVITE,10.INVITE,会话,主叫,被叫,信令,媒体,16,基本会话流程,17,UE产生第一个INVITE消息(1),INVITE sip:Impu-AKA-46001475731-SIP/2.0Via:SIP/2.0/UDP 154.24.77.33:12641;branch=z9hG4bK9e3f66a99503c8d7aa4f4eb1bb8f73a5Call-ID:s
19、bc9e3f66a99503c8d7aa4f4eb1bb8f73a5From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEMax-Forwards:70P-Preferred-Identity:P-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11Privacy:noneRequire:preconditionSupported:100relContact:Allow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,RE
20、FER,MESSAGE,/被叫的用户身份,/主叫的用户身份,/主叫的IP地址和端口号,P-CSCF1,1.INVITE,190.1.10.1,189.1.1.111,18,P-CSCF处理第一个INVITE消息(2),INVITE sip:Impu-AKA-46001475731-SIP/2.0Via:SIP/2.0/UDP 154.24.10.102:5060;branch=z9hG4bK676ehbdcgcacfzchgebhr7d52;Role=2;Dpt=75f2_16,SIP/2.0/UDP 154.24.77.33:12641;branch=z9hG4bK9e3f66a99503c
21、8d7aa4f4eb1bb8f73a5;rport=12641Route:Record-Route:Call-ID:sbc9e3f66a99503c8d7aa4f4eb1bb8f73a5From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Supported:100relPrivacy:noneP-Charging-Vector:icid-value=78f32f819e10cf148de3d7af70
22、c5142e.3485362059.13.12P-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.77.33“Session-Expires:600Min-SE:600Require:preconditionP-Asserted-Identity:,/主叫用户的公有身份,/接入网信息,/被叫用户身份,/计费标识,S-CSCF1,P-CSCF1,2.INVITE,19,S-CSCF处理第一个INVITE消息(3),INVITE sip:Impu-AKA-4600147
23、5731-SIP/2.0Via:SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bKc71arac22az654br2d4b45czh;Role=2;Dpt=75f4_16;sc=2-a;TRC=a01-ffffffff,SIP/2.0/UDP 154.24.10.102:5060;branch=z9hG4bK676ehbdcgcacfzchgebhr7d52;Role=2;Dpt=75f2_16,SIP/2.0/UDP 154.24.77.33:12641;branch=z9hG4bK9e3f66a99503c8d7aa4f4eb1bb8f73a5;rp
24、ort=12641Route:,Record-Route:,Call-ID:sbc9e3f66a99503c8d7aa4f4eb1bb8f73a5From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Max-Forwards:68Require:preconditionSupported:100relSession-Expires:600Privacy:noneP-Access-Network-Info
25、:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.77.33P-Asserted-Identity:,Min-SE:600P-Charging-Vector:icid-value=78f32f819e10cf148de3d7af70c5142e.3485362059.13.12;orig-ioi=Served-Party-IP-Address:154.24.77.33,AS地址被放在Route行第一个（Route顶跳）,SCSCF地址被放在Route行第二个,S-CSCF1,AS1,3.INVITE,20
26、,AS1产生第二个INVITE消息(4),INVITE sip:Impu-AKA-29120211561-SIP/2.0Via:SIP/2.0/UDP 154.24.114.118:6801;branch=z9hG4bK37c0041721d71fd2a06f45c6dbee2309Route:Call-ID:57911fd815ffda3c0426006be692ba00From:;tag=87c57d4f834b7af1a6011257ec2818efTo:CSeq:49429 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MES
27、SAGEContact:Privacy:noneP-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.56.244.4P-Charging-Vector:icid-value=6601e776817c5da4fe5f222a24f90424.3485359547.29.12;orig-ioi=P-Asserted-Identity:,Session-Expires:1800Min-SE:600,AS把自己的地址话 Via行顶部。AS执行B2BUA角色。,使用触发时Scscf
28、添加的Route,/call-ID更改为新的,/对话更改为AS1的地址,S-CSCF1,AS1,4.INVITE,21,S-CSCF处理第二个INVITE消息(5)发出到I-CSCF的消息,INVITE sip:Impu-AKA-46001475731-SIP/2.0Via:SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bKc71arac22az654br2d4b45czh;Role=2;Dpt=75f4_16;sc=2-a;TRC=a01-ffffffff,SIP/2.0/UDP 154.24.114.118:6801;branch=z9hG4bK37
29、c0041721d71fd2a06f45c6dbee2309Record-Route:,Call-ID:57911fd815ffda3c0426006be692ba00From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Require:preconditionSupported:100relSession-Expires:600Privacy:noneP-Access-Network-Info:3GP
30、P-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.77.33P-Asserted-Identity:,P-Charging-Vector:icid-value=78f32f819e10cf148de3d7af70c5142e.3485362059.13.12;orig-ioi=,起始ioi,S-CSCF1,I-CSCF2,5.INVITE,22,I-CSCF处理第二个INVITE消息(6),INVITE sip:Impu-AKA-46001475731-SIP/2.0Via:SIP/2.0/UDP 154.24.
31、10.103:5060;branch=z9hG4bKe7hacfz7c7hbcb1c5r676h7cz;Role=1;Dpt=75f6_16,SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bKdf4z5rz7affh4r1bh1rdg5dzg;Role=2;Dpt=75f4_16;sc=3-b,SIP/2.0/UDP 154.24.114.118:6801;branch=z9hG4bK37c0041721d71fd2a06f45c6dbee2309,SIP/2.0/UDP Route:Record-Route:Call-ID:57911fd815ffda
32、3c0426006be692ba00From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:,Privacy:noneP-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.77.33P-Charging-Vector:icid-value=78f32f819e10cf148de3
33、d7af70c5142e.3485362059.13.12;orig-ioi=,S-CSCF2的地址,I-CSCF的地址,I-CSCF2,S-CSCF2,6.INVITE,23,S-CSCF处理第二个INVITE消息(7),INVITE sip:Impu-AKA-46001475731-SIP/2.0Via:SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bKnlnt9viad9llsdtnatn497adw;Role=2;Dpt=75e4_16;sc=2-a;TRC=a01-ffffffff,SIP/2.0/UDP 154.24.10.103:5060;
34、branch=z9hG4bKe7hacfz7c7hbcb1c5r676h7cz;Role=1;Dpt=75f6_16,SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bKdf4z5rz7affh4r1bh1rdg5dzg;Role=2;Dpt=75f4_16;sc=3-b,SIP/2.0/UDP 154.24.114.118:6801;branch=z9hG4bK37c0041721d71fd2a06f45c6dbee2309,SIP/2.0/UDP Route:,Record-Route:,Call-ID:57911fd815ffda3c0426006b
35、e692ba00From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Max-Forwards:65Require:preconditionSupported:100relSession-Expires:600P-Asserted-Identity:,P-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;locatio
36、n-info=154.24.77.33Min-SE:600,SCSCF将自己添加到VIA和Record-Route头域中，Route头域顶跳为AS地址，第二跳为SCSCF地址,S-CSCF2,AS2,7.INVITE,24,AS2发起第三个INVITE消息(8),INVITE sip:Impu-AKA-46001475731-SIP/2.0Via:SIP/2.0/UDP 154.24.114.119:6802;branch=z9hG4bK999a409b278f328c300c07129a67d6a0Route:Call-ID:abc9e3f66a99503c8d7aa4f4eb1bb8f73
37、a5From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Max-Forwards:65Require:preconditionSupported:100relSession-Expires:600P-Asserted-Identity:,Privacy:noneP-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;l
38、ocation-info=154.24.77.33Min-SE:600,AS2地址添加到VIA头域中，Route携带触发时SCSCF2填写的地址,/call-ID改变为第三个对话的,/AS2发起这个对话,S-CSCF2,AS2,8.INVITE,25,S-CSCF2处理第三个INVITE消息(9),INVITE sip:154.24.77.33:12642;transport=udp SIP/2.0Via:SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bK48ild6adlcv9n4sdbndlwlcbw;Role=2;Dpt=75e4_16;sc=3-
39、b,SIP/2.0/UDP 154.24.114.119:6802;branch=z9hG4bK999a409b278f328c300c07129a67d6a0,SIP/2.0/UDP Route:Record-Route:Call-ID:abc9e3f66a99503c8d7aa4f4eb1bb8f73a5From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Max-Forwards:64Requir
40、e:preconditionSupported:100relSession-Expires:600P-Asserted-Identity:,Privacy:noneP-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.77.33Min-SE:600P-Called-Party-ID:P-Charging-Vector:icid-value=78f32f819e10cf148de3d7af70c5142e.3485362059.13.12,/AS2发起这个对话,/cal
41、l-ID是第三个对话的,/Route为被叫用户注册时保存的PCSCF地址,Request_URI重建：SIP_URI改变为IP地址，为用户注册的联系地址,/最小Session-timer时长,P-CSCF2,S-CSCF2,9.INVITE,26,P-CSCF2处理第三个INVITE消息(10),INVITE sip:154.24.77.33:12642;transport=udp SIP/2.0Via:SIP/2.0/UDP 154.24.10.101:5060;branch=z9hG4bKss4vi97b6ivb9ct8lvb694twv;Role=2;Dpt=75e2_36;TRC=a0
42、1-ffffffffRecord-Route:Call-ID:abc9e3f66a99503c8d7aa4f4eb1bb8f73a5From:;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:CSeq:60407 INVITEAllow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGEContact:Max-Forwards:63Require:preconditionSupported:100relSession-Expires:600Min-SE:600Privacy:noneP-Called-Party-ID:
43、P-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=234151D0FCE11;location-info=154.24.77.33P-Asserted-Identity:,VIA和Record-Route为PCSCF地址,P-CSCF2,10.INVITE,27,28,183,第个节点都会根据Via行的记录把183消息从被叫侧发回主叫侧183消息发回给主叫时Record-Route行不需要改变从被叫发回给主叫的路径是：被叫 P-CSCF2S-CSCF2AS2S-CSCF2I-CSCF2S-CSCF1AS1S-CSCF1P-CSCF1
44、主叫,P-CSCF2处理183消息,SIP/2.0 183 Session ProgressVia:SIP/2.0/UDP 154.24.10.104:5060;branch=z9hG4bK48ild6adlcv9n4sdbndlwlcbw;Role=2;Dpt=75e4_16;sc=3-b,SIP/2.0/UDP 154.24.114.118:6802;branch=z9hG4bK999a409b278f328c300c07129a67d6a0,SIP/2.0/UDP Record-Route:,Call-ID:abc9e3f66a99503c8d7aa4f4eb1bb8f73a5From:
45、;tag=9e3f66a99503c8d7aa4f4eb1bb8f73a5To:;tag=ba535f4b6a26f55394e5a5a078028f9eCSeq:60407 INVITEContact:Allow:INVITE,ACK,CANCEL,BYE,PRACK,UPDATE,REFER,MESSAGERSeq:100P-Charging-Vector:icid-value=78f32f819e10cf148de3d7af70c5142e.3485362059.13.12P-Access-Network-Info:3GPP-UTRAN-TDD;utran-cell-id-3gpp=23
46、4151D0FCE11;location-info=154.24.77.33Require:100relP-Asserted-Identity:,30,PRACK和后续请求,Invite请求时每个Proxy都会根据需要把自己的地址放在Record-Route行顶部，I-CSCF是个例外。UAS收到初始请求后，保存Record-Route里的路由地址集合，构建Route头域集合，然后并把Record-Route拷贝一份放到响应中发回给UAC，UAC收到响应把Record-Route集合翻转以构建自己的Route头域集合。后续请求按照保存的Route头域集合发送。从主叫到被叫的路由：主叫 P-CS
47、CF1S-CSCF1AS1S-CSCF1S-CSCF2AS2S-CSCF2P-CSCF2被叫,知识回顾,基本会话建立过程中经过了哪几个主要网元？,响应消息通过什么SIP字段路由？,后续请求通过什么SIP字段路由？,内容介绍,注册流程 呼叫流程 基本补充业务流程,32,主叫号码显示(CLIP)业务描述,“主叫号码显示”业务为被叫用户显示呼入方的号码。通过适当的主叫号码显示设备，IP，数字或者模拟电话均可以使用本功能。,33,主叫号码显示(CLIP)关键消息,34,主叫号码显示限制(CLIR)业务描述,“主叫号码显示限制”业务允许用户禁止自己的号码在被叫的电话上显示。设置好该功能后，用户在拨打电话
48、时，被叫将无法显示主叫的号码。但如果被叫有主叫号码显示限制逾越权限，即使主叫即使登记了该业务，其号码仍然会显示在被叫终端上。主叫号码显示限制可以是基于签约的，也可以是基于每次会话的。对于签约的主叫号码限制，每次呼叫，如果被叫方没有签约主叫号码显示限制逾越，被叫无法显示主叫号码。主叫号码显示限制也可以是基于每次会话的。用户当前并没有签约主叫号码显示限制业务，用户通过在被叫号码前加拨该业务码前缀来实现该业务，比如”*67”。一般而言这个对应的业务码前缀可以由系统预先定义.,35,主叫号码显示限制(CLIR)关键消息,36,无条件呼叫前转(CFU)业务描述,“无条件呼叫前转”业务，无论当前用户在什么
49、状态下，允许用户将所有来电前转到一个号码上，可以是群内号码或者群外号码，如固定、移动用户的号码。无条件前转优先于遇忙前转、无应答前转、用户未注册前转。,37,无条件呼叫前转(CFU)消息流程,38,无条件呼叫前转(CFU)关键消息,注：History-Info参见RFC4244的定义,39,遇忙前转(CFB)业务描述,“遇忙前转”业务允许用户的电话占线时，让用户自动转接所有来电到另一个电话号码上，可以是群内号码或者群外号码，如固定、移动用户的号码。,40,遇忙前转(CFB)消息流程,41,遇忙前转(CFB)关键消息,参见RFC4244的定义,注：History-Info参见RFC4244的定义
50、,42,无应答前转(CFNRy)业务描述,“无应答前转”业务允许用户的电话无人接听时，让用户自动转接所有来电到另一个电话号码上，可以是群内号码或者群外号码，如固定、移动用户的号码。,43,无应答前转(CFNRy)消息流程,44,无应答前转(CFNRy)关键消息,参见RFC4244的定义,注：History-Info参见RFC4244的定义,45,未注册呼叫前转(CFNRc)业务描述,“未注册呼叫前转”业务，允许用户在未注册状态时将所有来电前转到一个号码上，可以是群内号码或者群外号码，如固定、移动用户的号码。未注册呼叫前转优先于遇忙前转、无应答前转。该业务可以由用户通过在终端上操作设置，也可以由
