1. SIP多方会话消息 之实例讲解

2. Agenda
SIP INVITE第一个用户
SIP INVITE第二个用户
SIP 第三个INVITE
SIP 发送MESSAGE消息

3. SIP – INVITE第一个用户 目的：tom邀请第一个用户jerry加入会话 1 2 3 4
supported: 列举了UAC或UAS支持的扩展 Roster-Manager: “花名册管理员” 管理一个Session的用户登记列表 EndPoints: 列出当前会话中所有的接收方的SIP URI
INVITE sip: :2185;transport=tcp;ms-received-cid=200 SIP/2.0
contact:
via: SIP/2.0/TCP :9468;ms-received-port=3783;ms-received-cid=700
max-forwards: 70
from: “tom"
to:
call-id: 4517ca278efd43fa90361c0cc
cseq: 1 INVITE
Roster-Manager:
EndPoints: “tom"
supported: com.microsoft.rtc-multiparty
content-type: application/sdp
content-length: 133 1
SIP/ Trying cseq: 1 INVITE 2
SIP/ OK contact: cseq: 1 INVITE supported: com.microsoft.rtc-multiparty
content-type: application/sdp 3
ACK SIP/2.0 from: "tom"
to:
cseq: 1 ACK
content-length: 0 4

4. SIP – INVITE第二个用户 目的：tom邀请第二个用户jerry加入会话 1 2 3 4
require: UAC通过Require字段列出的选项标签，告知UAS处理请求时需要支持的选项 Roster-Manager: 还是第一个发起会话的用户作为花名册管理员 EndPoints: 列出当前会话中三方的SIP URI
INVITE sip: :2641;transport=tcp;ms-received-cid=400 SIP/2.0
contact: from: "tom"
to:
call-id: 4517ca278efd43fa90361c0cc cseq: 1 INVITE Roster-Manager:
EndPoints: "tom"
require: com.microsoft.rtc-multiparty
content-type: application/sdp
content-length: 133 1
SIP/ Trying cseq: 1 INVITE 2
SIP/ OK contact: cseq: 1 INVITE supported: com.microsoft.rtc-multiparty
content-type: application/sdp 3
ACK SIP/2.0 from: "tom"
to: epid= b14;tag=6dba5f dd1d626b5b1a13
cseq: 1 ACK
content-length: 0 4

5. SIP – 第三个INVITE 目的：vicky再邀请jerry加入会话 1 2 3 4
TriggeredInvite: 表明本次INVITE消息是被触发的，而不是vicky主动发起的
INVITE sip: :2185;transport=tcp;ms-received-cid=200 SIP/2.0
contact:
via: SIP/2.0/TCP :8426;ms-received-port=2641;ms-received-cid=400
max-forwards: 70
from:
to:
call-id: 4517ca278efd43fa90361c0cc
cseq: 1 INVITE
TriggeredInvite: TRUE
require: com.microsoft.rtc-multiparty 1
SIP/ Trying cseq: 1 INVITE 2
SIP/ OK contact: cseq: 1 INVITE supported: com.microsoft.rtc-multiparty
content-type: application/sdp 3
ACK SIP/2.0 from: "tom"
to:
cseq: 1 ACK
content-length: 0 4

6. SIP – 发送MESSAGE消息 目的：tom写一个message，实际上先后向vicky和jerry发送消息 1 2 3 4
MESSAGE SIP/2.0
contact: cseq: 3 MESSAGE content-type: text/plain; charset=UTF-8; 1 2
SIP/ OK contact: cseq: 3 MESSAGE 3
MESSAGE SIP/2.0
contact: cseq: 4 MESSAGE content-type: text/plain; charset=UTF-8;
SIP/ OK contact: cseq: 4 MESSAGE 4

7. 谢谢！