Short answer
A cloud PBX replaces your whole phone system, SIP trunks connect a phone system you already own to the public network, and Teams calling turns Microsoft Teams into your phone. FirstNet offers all three on its own ICASA-licensed voice network.
In detail
- Cloud PBX: FirstNet Managed Cloud PBX is a fully managed phone system with extensions, IVR, call queues, call recording, standard reporting and Linkus mobile and desktop softphones. It suits businesses replacing an ageing on-premises PBX, with optional AI Receptionist and AI Transcription.
- SIP trunks: FirstNet SIP Trunks connect any SIP-compliant PBX, on-premises or cloud-hosted, to the public telephone network. You keep your PBX, and FirstNet connectivity customers get a free backup trunk.
- Teams calling: Operator Connect adds phone numbers to Teams with no SBC on site. Direct Routing uses FirstNet-managed SBCs and keeps an existing carrier, custom routing or analogue devices in the picture.
The right choice usually depends on where your users already work and what you need to keep. The options also combine: a SIP trunk can sit under an existing PBX while other users move to Teams or Zoom Phone, and you can move from SIP trunks to Managed Cloud PBX or Teams later without changing the trunk underneath.
Source: FirstNet Voice service page →
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