1. H.323 Making A (Very Simple) Call

2. Client Gatekeeper Step 1: Query "Where is Wanda?"

3. Client Gatekeeper Step 2: Database Lookup 1) Is client authenticated? 2) Is Wanda active in the database? 3) Then retrieve Wanda's address.

4. Client Gatekeeper Step 3: Reply "Wanda is at 14.231.3.156."

5. Client Step 4: Establish session with Wanda Wanda "Can we talk?" H.225 used to establish session

6. Client Step 5: Negotiate features, abilities Wanda "G.729 okay?" H.245 used to agree on CODEC, etc.

7. Client Step 6: Ring, Answer, and Conversation Begins Wanda "Blah, blah, and blah...""Reply, and more blah..."

8. H.323 Protocols

9. Credit... The preceding slide was flagrantly plagiarized, but I always cite my sources. You may view the H.323 protocols slide in its context at: http://www.protocols.com/pbook/h323.htm Signed, Bob ("Sosumee") Young

10. The End