Samantha brings an IT-sector background and experience in 3CX consultancy and technical support. Read about our leadership and experience.
The main difference is where the phone system runs.
A SIP trunk connects an existing compatible PBX to the telephone network. A hosted PBX moves the call-control platform into a provider-managed environment and gives users access through phones and apps.
Choose SIP trunks when...
- Your existing PBX remains suitable and supported
- You want to retain established call flows and integrations
- Your team can maintain the PBX and its security
Choose a hosted PBX when...
- You want to replace ageing on-site hardware
- Remote users and mobile apps are important
- You prefer the platform and resilience to be managed
Number porting can preserve eligible existing numbers in either approach. Compare our SIP trunks, Hosted 3CX and number porting service.
Technical background
SIP is the signalling protocol used to establish, change and end communication sessions. Its core specification is RFC 3261: Session Initiation Protocol. For an example of how users work with a PBX, see the official 3CX user guide.