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Is the PortSIP PBX built on Asterisk, FreeSwitch?

No. PortSIP PBX is not based on any open source PBX project. It is a commercial PBX platform fully developed by the PortSIP engineering team.

At the protocol layer, PortSIP PBX is built on reSIProcatearrow-up-right, a mature and widely adopted open-source SIP stack written in C++. reSIProcate provides robust implementations of SIP, ICE, TURN, and related real-time communication protocols.

Many well-known technology companies—including Cisco, Poly, Dialogic, and Logic, have built commercial products using reSIProcate arrow-up-rightas a foundational SIP signaling layer.

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Why This Architecture Matters

Because PortSIP PBX is designed and implemented entirely in-house, rather than derived from an open source PBX framework, we are not constrained by legacy architectures or design limitations common in community-driven PBX projects.

This approach allows PortSIP to:

  • Rapidly innovate with modern Unified Communications and Contact Center features

  • Optimize performance at scale, from SIP signaling to media handling

  • Design true multi-tenant and cloud-native capabilities without architectural compromises

  • Deliver faster, more effective technical support, backed directly by the engineers who built the system

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Trusted by Customers

This level of architectural control and engineering ownership is a key reason why customers and service providers trust PortSIP PBX for mission-critical, large-scale cloud PBX, UCaaS, CPaaS, and CCaaS deployments.

PortSIP combines the proven reliability of an industry-standard SIP stack with the flexibility, performance, and innovation of a modern, fully proprietary PBX platform.

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