Chapter 23 Voice
VMG8825-B Series User’s Guide
249
Figure 151 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 113 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
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