1 What is VoIP? By Henry Sinnreich IR1 10/5/2004
True VoIP: Can you use SIP URLs?True VoIP: Can you use SIP URLs?
SIP URL: Put it on your business cards !! Give your customers. Accept no substitutes!
SIP: To support rich communications
UA MUST have the ability to use SIP URL
Can you be found using a URL?
Can you dial a URL?
If yes to both: You have VoIP
2 What is VoIP? By Henry Sinnreich IR1 10/5/2004
“VoIP” version 00: Arbitrage for LD calls
LEC Private IP LECMedia
GatewayMedia
Gateway
MG Controller
The “softswitch” emulates the PSTN switch and has various incarnations:
- LD and international arbitrage
- Class 5 switch services
Mostly proprietary, works in one single network only (SIP to interconnect)
User still get only an analog phone, or its equivalent
No integration with other IP services, user sees no IP!
Stiff competition from mobile phones and IP communications
Significant equipment sales by manufacturers
Less lucrative for service providers (oversupply of commodity telephony)
Regulate!
Tax!
3 What is VoIP? By Henry Sinnreich IR1 10/5/2004
“VoIP” version 01: Gateway service to the PSTN
Private IP or
InternetLEC
Gateway
PSTN replacement for local + LD
Limited lifetime as IP-IP traffic and mobile voice is increasing
Time
Traffic
Projection by Teresa Hastings/MCI
*User sees no IP
Regulate!
Tax!
4 What is VoIP? By Henry Sinnreich IR1 10/5/2004
VoIP Islands: IP to IP calls go over the PSTN
ISP PSTN ISP
Gateway Gateway
IP PBX IP PBX
Most VoIP networks are isolated islands
Must use the PSTN for off-net calls
Enterprise VoIP supports IP-IP only inside the corporate network, or even only in one single location
Public VoIP networks support IP-IP only inside their own network
Global IP-IP is perceived as business threat by IP-PSTN gateway service providers (can add no value)
Regulate!
Tax!
5 What is VoIP? By Henry Sinnreich IR1 10/5/2004
ENUMquery
SIP-1 SIP-2
Internet
Gateway
DNS
PSTNSwitch
PSTN
Reach any device on IP or PSTN
Presence, phone number or URL to reach any device on IP or PSTN
Beyond Voice: Global IP Communications
IP communications are integrated with applications
AOR to Contact Address
