OnSIP vs Zoom Phone

OnSIP is a business phone system with multiple business numbers, an auto attendant, custom call routing, and voicemail transcription. It provides desktop and mobile apps as well as a browser softphone, available in Chrome, Firefox, and Opera. Apps are listed for Windows, Mac, iPhone, and Android. The free plan supports up to 100 users and unlimited extensions, and includes Zendesk, HubSpot, and Odoo integrations. Free SIP accounts cannot dial regular phone numbers; paid plans offer a SIP-to-PSTN gateway. Paid plans start at $18.95/user/mo, and a 30-day trial is listed. Month-to-month contracts are available, with payment based on users and features. A SIP address can have active registrations on up to 10 devices. Softphone apps provide end-to-end encryption, and encryption is also available for desk phones. When both parties use the OnSIP app, professional call-link media is encrypted using DTLS SRTP. The Admin Portal supports setup, real-time feature edits, payment and contact management, and invoices.

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.