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OnSIP offers a range of features, including call management, call recording, video calling, and a user-friendly admin portal. It also provides auto-attendants, ring groups, queueing, and voicemail.

OnSIP does not provide SMS or team messaging services with their business phone system, although their phone numbers may be compatible with SMS messaging.

OnSIP offers a free plan for new customers and a range of paid plans, including an unlimited 'per month per user' option and a flat monthly rate option where you'd have to pay-as-go for the calls and other charges you incur. The pricing structure is meant to be competitive and suitable for businesses with varying call volumes.

OnSIP integrates with browsers like Google Chrome, allowing users to place calls directly from their browser. However, it does not integrate with many other software, especially productivity suites or CRM software, aside from Zendesk and Hubspot.

OnSIP uses Session Initiation Protocol (SIP) to enable VoIP calling, while regular phones rely on dedicated lines and traditional phone systems. OnSIP offers dynamic resource allocation and internet connectivity, while conventional phones do not.