| |
 |
Traditional
Circuit Switching PBX |
|
Packet
Switching IP-PBX |
|
| Architecture |
|
Centralized
|
|
Fully
distributed |
|
| Wiring |
|
Star
topology; each desk requires a wiring from the cabinet
|
|
River
topology; IP extensions can be deployed at any node
over TCP/IP networks |
|
| Capacity |
|
Capacity
is limited by the hardware framework
|
|
Scalable
capacity, depend on bandwidth and processor capability
|
|
| Scalability |
|
Complexity
of system scalability depends on system size
|
|
Scalability
can be done by using the same architecture
|
|
| Networks
Convergence |
|
Voice
and data require two separate networks
|
|
Voice
and data are converged in one network
|
|
| Internet
Connectivity |
|
Connect
to Internet via VoIP gateway |
|
Internet
ready |
|
| MACs |
|
Move,
add, change extensions require physical connection
adjustments |
|
Simplified
MACs; move, add, and change extensions can be as
easy as plug-and-play |
|
| Extended
Application |
|
Traditional
voice & call processing features
|
|
All
add-on voice & call processing features implemented
by software |
|
Voice
applications |
|
Applications
require designated interfaces and equipment
|
|
Software-based
applications; easy to be implemented
|
|
Server
redundancy |
|
N/A.
Another complete PBX system can be configured as
a backup system |
|
Support
server level redundancy |
|
| System
configurations |
|
Configuration
is done via phone set with command codes in common
|
|
Provide
GUI or even web-based interface configuration
|
|
| Off-premises
extensions |
|
Do
not support remote extensions |
|
Remote
workers and office are linked altogether by VPN/WAN
|
|
| Multi-location |
|
Cross-system
linkage requires dedicated ISDN |
|
Systems
are connected by cost efficient Internet resources
|
|
| CTI
integration |
|
Complex
integration between PCs and telephones
|
|
PCs
and phones are already integrated in one voice/data
network |
|
| Average
Cost Per Seat |
|
Low
to high, positively correlated with functionality
and capacity |
|
Low
to medium, independent of capacity
|
|
 |
|
|
