# C H.323 Call Flows and Message Traces

Purpose

The following diagrams depict some of the basic H.323 call flows. They are examples and not necessarily functional call flows.

The corresponding message traces follow the diagrams. These message traces include output from a protocol analyzer and examples of API messages.

In this section:

Call Flows

Call Release Call Flows

ITU-T standard defines a set of call control, channel setup, and codec specifications for transmitting real-time voice and video over networks that do not offer guaranteed service or quality of service.