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PSTN = Public Switched Telephone Network
Although the PSTN is effective and does a good job at what it was built to do (switch voice calls), many businesses are striving to change it to a new network whereby voice rides on top of a data network.
Drawbacks to the PSTN
Data has overtaken voice as the primary traffic on many networks built for voice.
The PSTN cannot create and deploy features quickly enough. Only the venders of the equipment could develop the applications for that equipment.
Data, Voice, & Video cannot converge on the inflexible PSTN as currently built.
Wasted bandwidth using a 64k connection.
VoIP = Voice over IP
Provides an advanced digital communications network that bypasses the traditional public switched telephone system and uses the Internet to transmit voice communication.
VoIP Signaling Protocol
H.323 - ITU standard for transmitting audio video and data across an IP network.
IP Telephony
IP Telephony is the technology which allows for data, voice, and video to be transmitted over a single, IP based network infrastructure.
IP Telephony Pilot Project
In the 4th Q 2000, Network Services, in cooperation with Telecommunications and OIR have begun to implement IP Telephony on the UF campus. Cisco’s AVVID (Architecture for Voice, Video and Integrated Data) family of products were chosen because of their scalability and availability in the current market.
MCS-7835 Call Mgr. Telecomm
MCS-7835 Call Mgr. NERDC
MCS-7835 Call Mgr. OIR
7960
7960 DDF/CETS
7960
7960
C3524-PWR
C3524-PWR
C3524-PWR
C3524-PWR
PSTN Service
CI SCO V G200V OICE GATEWAY
P OWER RP S ACTI VITY
VG200
Analog Gtwy -4
Analog Gtwy -4
UF Campus Core
UF AVVID Campus Pilot
PRI(future)
Key Benefits
Lower Total Cost of Ownership:– reduced PSTN circuits– reduced long distance– reduced operational costs (MAC)– unified MIS for voice & data
Key Benefits (cont’d)
Next generation business applications:
Unified messagingintegrated email, voice mail, fax
Web-Telephony Integration / CTI
push / pull technologytelecommuting / tele-learning
The Next Steps
Rollout phones to test sites
H.323 Gateway to PSTN
Call Manager Clustering
Unified Messaging
Cisco IP Phone Model 7960 Executive set:
– 6 programmable line /feature
– 4 interactive soft keys:• Messages
• Directory
• Help
• Settings
• Services
– graphic capability
Cisco Call Manager
Administration– phone / user setup– features:
• caller id• call forwarding• call park / hold• DID / DOD• Distinctive ring• Call Detail Records• Etc.
VoIP Issues
Call Management– cost accounting– cost modeling / production pricing– admin policy– dial plan
VoIP Issues (continued) QoS
– bandwidth limitations– Traffic Shaping (control the usage)– delay– jitter– packet loss
VoIP Issues (continued)
Wireless Applications Open Interoperability
– standards development Security
– 911, E-911– network– policy