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338 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
Third Party Call Control (3PCC) Operations and Multimedia Support
The Internet Engineering Task Force (IETF) has defined RFC 3725 - Best Current Practices for
Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP). RFC 3725 is available at
http://ietf.org/rfc/rfc3725.txt.
Section 5.1.2, “Global Call Library and IP Media Library for Third Party Call Control”, on
page 341 describes how to configure the Dialogic
®
Global Call API library in third party call
control (3PCC) mode or first party call control (1PCC) mode. Global Call behavior in 3PCC mode
is similar to the behavior in 1PCC mode, except that media and session control are independently
managed in 3PCC mode. This provides greater flexibility to 3PCC mode applications.
Figure 63 shows a basic third party call control connection:
Figure 63. Third Party Call Controller
First Party
Signalling/
Media Endpoint
First Party
Signalling/
Media Endpoint
Third Party
Call
Controller
IP Network
RTP Media
S
IP Signaling
SIP Signali
ng
SIP Signaling