1. Deploying IP Telephony
Presented by Kundan Singh
Joint work with Wenyu Jiang, Jonathan Lennox, Sankaran Narayanan, Prof. Henning Schulzrinne and Xiaotao Wu of Internet Real-Time (IRT) laboratory
10 slides; 15 min

2. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
Overview
Phone call + Internet
User identifier
Session Initiation Protocol - SIP
office.com
Bob
(2)
(1)
pc4.columbia.edu
(3)
home.com
columbia.edu
Deploying IP Telephony

3. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
Personal mobility
yahoo.com
tel:
Home
tel:
Mobile
cs.columbia.edu
host.cs.columbia.edu
Office
Deploying IP Telephony

4. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
Forking, redirection
Media path
Control path
Office
Forking
Mobile
Visiting university
Redirect
Bob
columbia.edu
Home
Deploying IP Telephony

5. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
Clients and servers
IP phones
Server
Proxy, register, redirect.
Programmable.
Hardware phones
Urgent
SIP server
Phone
script
Low-priority
Voic
Software phones
Deploying IP Telephony

6. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
More services
Conferencing
Voice/video mail
Interactive voice response
Beyond telephony:
Presence and instant messages
Integration with web,
device control, network games
Deploying IP Telephony

7. Interworking with regular phone
What is IP telephony?
What to build?
How to deploy?
What are the issues?
Interworking with regular phone
x7040
(212)
Telephone
network
(PSTN)
Telephone
subscriber
PBX
SIP/PSTN
gateway
SIP server
IP endpoint
Translating:
Audio – better codecs on IP
Signaling – some features are lost
Identifiers – phone numbers
Determining transition points
Deploying IP Telephony

8. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
CINEMA
Configuring
Phones
Gateway, PBX
Services, user profiles
Architecture
multimedia communication environment
synchronous + asynchronous
More info:
User interface:
Deploying IP Telephony

9. Deploying IP Telephony
What is IP telephony?
What to build?
How to deploy?
What are the issues?
Future work
Reliability (network, software)
QoS (network, media)
Security (authentication, privacy, attacks)
System scalability
Service creation
Accounting and billing
Emergency communications
Integrating with natural environment
Advanced conference control
NAT and firewall
Deploying IP Telephony

10. Deploying IP Telephony
Summary
What is IP telephony?
SIP, personal mobility, -like identifiers
What to build?
Client IP phones; proxy and registration server; conferencing, voic , etc.
How to deploy?
Gateway to PSTN; CINEMA configuration
More issues
Reliability, QoS, Security
Deploying IP Telephony