ZyXEL VMG4927-B50A User Guide - Page 229
User Agent 1, Proxy 1, User Agent 2, Proxy 2, PROXY 1, PROXY 2
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Chapter 21 Voice Figure 136 SIP Call Through Proxy Servers DSL DSL The following table shows the SIP call progression. Table 102 SIP Call Progression UA 1 PROXY 1 Invite Invite 100 Trying ACK RTP 200 OK 180 Ringing 200 OK PROXY 2 Invite 100 Trying 180 Ringing 200 OK UA 2 180 Ringing 200 OK RTP BYE 1 User Agent 1 sends a SIP INVITE request to Proxy 1. This message is an invitation to User Agent 2 to participate in a SIP telephone call. Proxy 1 sends a response indicating that it is trying to complete the request. 2 Proxy 1 sends a SIP INVITE request to Proxy 2. Proxy 2 sends a response indicating that it is trying to complete the request. 3 Proxy 2 sends a SIP INVITE request to User Agent 2. VMG4927-B50A / VMG9827-B50A User's Guide 229
Chapter 21 Voice
VMG4927-B50A / VMG9827-B50A User’s Guide
229
Figure 136
SIP Call Through Proxy Servers
The following table shows the SIP call progression.
1
User Agent 1
sends a SIP INVITE request to
Proxy 1
. This message is an invitation to
User Agent 2
to
participate in a SIP telephone call.
Proxy 1
sends a response indicating that it is trying to complete the
request.
2
Proxy 1
sends a SIP INVITE request to
Proxy 2
.
Proxy 2
sends a response indicating that it is trying to
complete the request.
3
Proxy 2
sends a SIP INVITE request to
User Agent 2
.
Table 102
SIP Call Progression
UA 1
PROXY 1
PROXY 2
UA 2
Invite
Invite
100 Trying
Invite
100 Trying
180 Ringing
180 Ringing
180 Ringing
200 OK
200 OK
200 OK
ACK
RTP
RTP
BYE
200 OK
DSL
DSL