FreeSWITCH vs Plum DEV

FreeSWITCH is an open-source framework for real-time voice and video communications. It can route calls, bridge video, transcode media, and connect protocols, and is designed for use in carriers, contact centers, and communication products. Its Event Socket exposes call control, channel management, and internal events to external processes over TCP. Integrations include HTTP backends, embedded Lua, Perl, Python, JavaScript, Java, and SignalWire connectivity. The mod_signalwire module connects to SignalWire for inbound and outbound PSTN calling over a persistent WebSocket session. Linux installation guidance covers Debian and Ubuntu using SignalWire packages or a source build. A free SignalWire account is required to access packages and downloads. FreeSWITCH is licensed under MPL 2.0 and can run in production at no cost; self-hosting requires dedicated resources to maintain on-premises infrastructure. The open-source edition has community support, while FreeSWITCH Pro offers commercial support, hardened builds, priority patches, and commercial modules including answering machine detection and licensed G.729 Annex A encoding and decoding.

Plum DEV is a cloud developer platform for automating processes through voice and building interactive customer self-service applications. Its VoiceXML foundation lets developers control customer interactions, including inbound IVR and inbound or outbound SMS. SMS requires an SMS-ready phone number. APIs connect DEV with CRM, ERP, voice-of-customer, telephony and other database systems, and it also works with Plum Fuse. Developers can customize branding, call flows and backend database integrations. Multiple text-to-speech and automatic speech-recognition engines are supported, including Amazon Polly, with dozens of languages and dialects. Integrated VoiceTrends tracks usage and performance, supports script A/B testing and provides granular reports. Plum says DEV runs on custom telephony data centers and AWS, with on-demand scalability and a 99.9% uptime SLA. It describes the platform as PCI-DSS Level 1 and HIPAA compliant, while customers remain responsible for configuring applications for applicable requirements. Pricing is available on request. Demo accounts have limited access and no call logging.