Internet Communications Using SIP : Delivering VoIP and Multimedia Services With Session Initiation Protocol {2Nd Ed.}

Figure 19.6 Call flow example for interactive voice response service

1 INVITE

CALLER CONTROLLER IVR SERVER

3 200 OK

MEDIA

2 INVITE

Welcome! Please speak

your ID

My ID is 12345

12345, is this correct?

Yes

1 - Controller first

connects caller to

IVR server

2 - IVR input from

caller is transmitted

to controller using the

HTTP side channel.

New instructions to

the IVR are sent by

the controller.

3 - IVR is disconnected

and the call setup

proceeds based on

caller input to the

IVR server

How can we help?

Would like to add High

Speed Internet access

to my service

Thank you! We will

transfer you to new

installations of High

Speed Internet service

to schedule an

appointment. One

moment please...

5 ACK

MEDIA

11 200 OK

10 INVITE

12 INVITE

7 HTTP 200 OK

6 HTTP GET

MEDIA

9 HTTP 200 OK

8 HTTP GET

4 183

334 Chapter 19