PortSIP PBX vs Zoom Phone

PortSIP PBX is a multi-tenant communications platform for service providers and MVNOs offering Cloud PBX, UCaaS, CPaaS, and CCaaS services. It brings together call routing, SMS, WhatsApp, team messaging, contact center functions, and voice and video meetings. Customers can run it in their own data center, on premises, or on Azure, AWS, and Google Cloud; Docker deployment is supported. PortSIP says a deployment can support 50,000–100,000 simultaneous online users. Contact center tools include skill-based routing, queue strategies, wallboards, analytics, callback, and real-time monitoring and training. AI features include call and voicemail transcription, generated notes and summaries, and sentiment analysis. Microsoft 365 integration supports user provisioning, SSO, and directory and contact synchronization. Developer options include REST APIs, Pub/Sub, messaging APIs, webhooks, a calling SDK, and call control APIs. The Free Edition costs nothing and includes all features, up to two simultaneous calls, and three extensions. Paid perpetual and annual licenses provide access to all features and are based on extension users; prices require a quote. The platform and its apps support SRTP and DTLS-SRTP media encryption, with AES-256 when enabled. The product page advertises 24 x 7 support.

Zoom Phone is a cloud VoIP phone system for making and receiving calls over broadband internet. Its connected communications offering supports calls, video, chat, SMS and fax, with desktop and mobile apps. Call management includes auto attendants, IVR, call queues, business-hours routing, recording and voicemail transcription. Plans include post-call summaries, voicemail prioritization and task extraction. You can port existing numbers or purchase new ones; a domestic number is included. Zoom lists integrations with Salesforce, Slack, Contact Center, Microsoft and Google, and APIs for adding phone capabilities to custom applications. Global PSTN coverage is listed in 49+ countries, with an option to bring your own carrier. Zoom states 99.999% uptime and lists E911 and failover options through Zoom Phone Local Survivability. Plan details list 256-bit authentication and media encryption support, FedRAMP Moderate compliance, and 24x7 live chat and phone support. Pricing starts at $10 per user per month for Metered calling. There is no free plan, though a free trial is available.