VoIP Basics covers the components and call flow of VoIP systems using Cisco Call Manager Express (CME). It discusses how VoIP digitizes voice into data packets using codecs and DSP chips. Key benefits of Cisco Unified Call Manager (CUCM) include supporting audio and video, operating in redundant server clusters, and integrating directories. CUCM uses a clustered server setup with an Informix database for call signaling and media.

1. VoIP Basics

2. Topics To be covered
■ Some Basics
o Components
■ CME Call Flow On-Network Cisco IP Phones

3. What is it?
● Taking the Digitized voice and placing them
into a data packet with IP address
information in the headers

4. What is the Big deal?
● Forward over WAN
● Reduce Cost. No need to run voice and Data
Cables
● Easy Maintenance
● Phone moves with you

5. Codecs
● Converting Analog to Digital and Vice Versa
● Some common codecs
o G.279
o MPEG 1
o MPEG 4
o Most Popular MP3

6. DSP Chips does it

7. Basics of VoIP
● VoIP world
o Real-Time Transport Protocol (RTP) Operates at the
Transport layer On Top UDP
o Real-time Transport Control Protocol (RTCP)

8. Cisco Terminology
Unified Communications
● Keyword “Unified”
● CUCME (Uses Router)(SME)
● CUCM (The Big brother)
● Cisco UNITY
● Unified Presence

9. Key Benefits of CUCM
● Full Support of Audio and Video
● Appliance based operation
● Redundant Server Cluster (Guess how many
phones?)
● DRS?
● Directory integration

10. Cluster setup
● Not the typical server cluster
● Multiple individual servers working for the
common good
● Informix Database (Database gurus, One
way replication)

11. Database Relationship

12. CUCM Signaling and Media Paths