Information Technology Reference
In-Depth Information
■
3XX:
These responses indicate redirection.
■
4XX:
These responses indicate client errors.
■
5XX:
These indicate server errors.
■
6XX:
These indicate global failures.
So, that's the theory, but how does it work in practice?
Figure 3-4
illustrates a typical SIP session established via a proxy server.
FIguRE 3-4
SIP Session
Established via a Proxy
Server
Proxy Server
UA #1
UA #2
IP
INVITE
TRYING
INVITE
TRYING
RINGING
RINGING
OK
OK
ACK
RTP/RTCP
BYE
OK
