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Cloud SIP

Most telephony systems need to be able to make and receive calls from the PSTN (Public Switched Telephone Network), in order to communicate with customers and route calls using traditional phone numbers.

Cloud SIP provides connectivity using SIP to the PSTN or to your custom built applications. It offers transport layer security and call recording, is self-manageable and can be instantly provisioned.

Cloud SIP supports VoiceML, so it can be integrated with your custom backend to extend its behavior.

Key capabilities

PSTN connectivity

Use Cloud SIP as a SIP trunk. Make calls to traditional PSTN phone numbers by connecting Cloud SIP to your existing SBC, call server, PBX or contact center solution.

Load balancing

Direct incoming calls from Enfonica hosted phone numbers to your existing SBC, call server, PBX or contact center solution. Set up load balancing policies to enable traffic sharing, prioritization and failover.


Intercept calls going through Cloud SIP to extend the standard behavior. For example, you can modify CLI (Caller ID), implement white/black lists, play pre-recorded or TTS prompts, and more.

How does it work?

You use Cloud SIP through SIP domains which you create using the Enfonica Console. A SIP domain is a FQDN (Fully Qualified Domain Name) which uniquely represents the domain of your service. The FQDN is of the format:


You configure your existing SBC, call server, PBX or contact center solution to send and receive calls to and from this SIP domain.

High availability

Cloud SIP is designed for high availability. Enfonica deploys multiple edge proxies for signalling and media across different cloud zones, and operates all supporting services in either multi-master or master-slave modes. Automatic routing and failover is used internally across multiple carriers and paths to enhance reliability of PSTN connectivity.


Cloud SIP is currently available in Australia and New Zealand via our Sydney region.

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