
Analog-PBX vs. VoIP-PBX
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Analog-PBX vs VoIP-PBX. VoIP PBX has significant advantages comparing to traditional Analog PBX.
Costs:
VoIP PBX withmuch better on cost-efficiency. You can use an old x86 PC to build a Enterprise-Class PBX.
Functions:
VoIP PBX has rich functions with very low costs, so small business or individual home could own a Enterprise-Class PBX, which just big companies had it in the past.
Extension Capacity:
For analog PBX, Extension quantity relayed on the the quantity of hardware extension expanding card. You had to purchase a lot of such card to expand extension quantity.
By comparison, VoIP could have unlimited extension theoretically.
Remote extension:
Only works on VoIP PBX
Analog PBX | VoIP 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 Application | 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 |
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 tomedium, independent of capacity |
Free IP PBX solutions:
- Asterisk (FreePBX)
- Freeswitch (FusionPBX)
- SIPFoundry
- OpenSIPS
- Kamailio
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