# 6 Call Agent

Purpose

This chapter explains the Call Agent feature in the CSP.

In this section:

Overview

NPDI Data Model

Virtual IP Channels

Deploying Call Agent

Sample Configuration File for Call Agent

Call Agent Reconnect

Outbound SIP Call with Call Agent

Session Description Protocol (SDP) Pass-Through for Call Agent Mode

Support REFER Request in Call Agent

PPL Event Request for RE-INVITE Message

Call Flows