What is the PSTN in a Contact Center?
Last Updated September 28, 2026
The public switched telephone network, or PSTN, is the traditional global telephone network used to connect voice calls between phone numbers. In a contact center, the PSTN may carry the customer-facing portion of a call even when routing, recording, agent desktops and other service functions are delivered through cloud or IP-based technology.
How the PSTN fits into contact center services
- A customer dials a business phone number.
- The call travels through a carrier or public telephone network.
- The contact center platform receives the interaction.
- Routing determines the appropriate queue, self-service path or agent.
- The agent may handle the call through cloud or IP-based voice technology.
- Call and customer data are recorded for reporting and service workflows.
PSTN vs. VoIP
What contact center services include
- Inbound and outbound voice.
- Digital channels.
- Interaction routing.
- IVR and voice self-service.
- Agent workspace.
- Recording and quality management.
- Workforce management.
- Analytics and reporting.
- AI-powered self-service and agent assist.
Why telephony architecture still matters
Voice quality, call delivery, resilience, geographic coverage and emergency or regulatory requirements can all depend on telephony design. Cloud contact centers reduce the need for on-premises switching but still require reliable carrier connectivity.
Organizations should understand where responsibility sits across carriers, cloud platforms and internal network components.
Cloud contact center evolution
Modern contact center platforms increasingly abstract much of the telephony complexity behind cloud services. This can simplify deployment and support distributed agents while also making it easier to connect voice with messaging, chat and other channels.
The customer should experience one service operation regardless of the underlying network path.
Evaluate voice service performance
- Call connection success.
- Audio quality.
- Dropped calls.
- Routing accuracy.
- Latency.
- Carrier availability.
- Failover behavior.
- Resolution and customer effort.
How NiCE is Redefining Customer Experience
NiCE offers the industry’s only unified AI platform for customer service automation. CXone revolutionizes how organizations automate customer service from start to finish—with channels, data, end-to-end workflows, and enterprise knowledge converging to improve customer experience at scale. With domain specific AI trained on the industry’s largest CX dataset, an open framework with endless integration possibilities, and a complete suite of advanced AI applications, CXone is one platform built for organizations of all sizes to deliver seamless customer service experiences, boost operational efficiency, and drive better outcomes.
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