This is the latest in the series and is finally done! You can expect in-depth coverage of H.323, SIP, Skinny, codecs, RTP, RTCP, VoIP architectures along with a touch of traditional telephony. This book also marks a change in the lab activities for the books. In the event that readers cannot get the labs done with their own gear, I will be providing the capture files here. That way you can still do the analysis. Resources The current O'Reilly page for the book is here:

Packet Guide to Voice Over IP

Chapter 1 - Introduction to VoIP

Video part 1:

Video part 2:

Activity 2 - SIP capture file

Activity 2 - H.323 capture file

Activity 2 - Skinny capture file

Activity 5 uses the same files.

Chapter 2 - Traditional Telephony

Video part 1 -

Video part 2 -

Video part 3 -

You do not need to download files for this chapter's activities.

Chapter 3 - SIP

SIP Video Part 2 -

SIP Video Part 1 -

Activity 2 - SIP capture file #1 - side

Activity 2 - SIP capture file #2 - side

Activities 3, 4 and 5 use the same files.

Chapter 4 - RTP

All activities will use the same files. Remember that with RTCP there are multiple headers...


From 111-1111: Activities-h323-111-1111

From 111-2222: Activities-h323-111-2222

Chapter 5 - Codecs


Hello audio file: hello.mp3

I use Audacity for most of my audio work - it is a powerful tool and free.

Chapter 6 - H.323

Activities 1-4: Activity-6-1-4-111-1111.pcap

Activities 1-4: Activity-6-1-4-111-2222.pcap

Activities 5: Activity-6-5-polycom-h323.pcap

Note: Since the H.323 Avaya configuration used tunneling, I've included the Polycom H.323 capture which does a better job of depicting H.245.

Chapter 7 - Skinny


Phone registration: phone1-registration.pcap

Skinny Source Side: skinny-source-end.pcap

Skinny Receiver Side: skinny-receiver-end.pcap

Activity 5 files - These are for the large topology build and contain captures for all three networks. network: 2cme-1-network.pcap network: 2cme-2-network.pcap network: 2cme-3-network.pcap