Chapter 9 Voice
to the IP address that it received back from the redirect server. Redirect servers do not initiate SIP requests.
In the following example, you want to use client device A to call someone who is using client device C.
1Client device A sends a call invitation for C to the SIP redirect server (B).
2The SIP redirect server sends the invitation back to A with C’s IP address (or domain name).
3Client device A then sends the call invitation to client device C.
Figure 98 SIP Redirect Server
SIP Register Server
A SIP register server maintains a database of SIP
RTP
When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to handle voice data transfer. See RFC 1889 for details on RTP.
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