Glossary

What is PSTN (Public Switched Telephone Network)?

The Public Switched Telephone Network (PSTN) is the traditional global telephone network that uses circuit-switched connections to carry voice calls. It includes landlines and legacy mobile networks.

While PSTN remains widely used, businesses are increasingly migrating to VoIP and SIP-based systems for lower costs, better scalability, and integration with digital communication platforms. PSTN-to-VoIP gateways allow hybrid setups.

InboxCentral's telephony integrations bridge PSTN and VoIP through partners like Tata Tele and Airtel, enabling businesses to manage traditional and digital voice in one platform.

Related InboxCentral feature

Voice & IVR

Related terms

SIP (Session Initiation Protocol)

A signalling protocol for initiating and managing voice and video calls.

SIP Trunking

A service that connects a business phone system to the PSTN via the internet.

WebRTC

A browser technology enabling real-time voice and video without plugins.

See it in action

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