Class 4 Softswitch

Document Metadata

Category: Infrastructure & Connectivity / SIP Devices
Audience: Network Engineers, Administrators, Support Team
Difficulty: Intermediate to Advanced
Time Required: Approximately 30–45 minutes
Prerequisites: Active ConnexCS account with permissions to manage SIP devices (DIDs, gateways, SIP endpoints) and access to Device Configuration modules.
Related Topics: SIP Device
Next Steps: After configuring your SIP devices, perform end-to-end call tests (inbound/outbound), monitor device registration and usage in the Reporting module, and schedule regular review of firmware and configuration settings for security compliance.

ConnexCS is a Class 4 Cloud-based Softswitch (software switch).

This means the call never terminates with the ConnexCS system.

The platform only handles call routing.

Class 5 switches perform call termination functions such as answering calls, playing messages, and more.

ConnexCS is delivered as a service, more precisely as a PaaS (Platform as a Service).

It enables clients to deploy a massively scalable distributed system across the globe with minimal technical expertise.

SBC, Class 4 Softswitch, or Proxy?

We've given extensive consideration to whether to brand our system as a Class 4 cloudswitch or an SBC (Session Border Controller).

The typical Border part of the Session Border Controller blurs out because our platform delivers Over The Top (OTT), sitting on cloud architecture.

An SBC is almost always a Class 4 switch, but a Class 4 switch doesn't have to be an SBC.

You can also deploy Class 5 switches or your dialers to communicate using our Class 4 Switch.