Zyxel IES-1000 EE [107/368] Figure 42 sip call through proxy servers

Zyxel IES-1000 EE [107/368] Figure 42 sip call through proxy servers
Chapter 17 VoIP
VOP1224-61 User’s Guide
107
The following figure shows the SIP and session traffic flow between the user
agents (UA 1 and UA 2) and the proxy servers (this example shows two proxy
servers, PROXY 1 and PROXY 2).
Figure 42 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.
Table 32 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
UA 1
UA 2
PROXY 1
PROXY 2
SIP
SIP
SIP
SIP & RTP

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