Difference Between VOIP and PSTN

Difference Between VOIP and PSTN

VOIP Features

Feature

VoIP

PSTN

Pricing

Free (local and international) VoIP-to-VoIP calling, calls to landline and mobile phones have nominal charges. No free calls. International calling is very costly. Phone plans usually cost around £15 to £30 per month depending on the service provider.

Connectivity type

All channels carried over one Internet connection Dedicated telephone lines

Required bandwidth

Requires 10 Kbps in each direction Requires 64kbps per line (in each direction)

Call forwarding

Some VoIP service providers offer free call forwarding, while others offer it for an extra fee. Extra fee charged to enable this feature

Call waiting

Most VoIP service providers offer free call waiting. Extra fee charged to enable this feature

Call transferring

Some VoIP service providers offer a free call transfer feature, while others do not support call transferring. Extra fee charged to enable this feature

Business continuity

Service terminates when Internet connectivity is lost. Organizations must have an alternative solution for VoIP connectivity. Service remains active during power outages because phone jacks don’t require electric power. But cordless phones require electric power and would be unusable in a power outage.

Scalability

Upgrades require more bandwidth and software updates. Upgrades require purchasing more hardware and dedicated lines, which can be very costly.

Remote extensions

This feature is standard. This feature requires dedicated lines for each extension and is very costly.

Emergency calling

Depends on the service provider, but emergency calling is usually not provided by VoIP. Emergency calling is enabled.

 

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