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Call routing

Bring your own carrier (BYOC)

Keep your existing SIP trunk provider and combine carriers for redundancy.

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Bring your own carrier (BYOC) means you connect the SIP trunk provider of your choice directly to Voxbi, rather than being locked into a single carrier that comes bundled with the phone system. Your existing phone numbers, carrier agreements, and rates all stay in place. What changes is the phone system itself, which becomes the full feature set of Voxbi's cloud PBX.

For enterprises, multi-site businesses, and organisations that have already negotiated carrier contracts or operate across regions with different regulatory requirements, BYOC removes one of the biggest migration barriers: the fear of losing a carrier relationship or a phone number that took years to establish.

When you'd use BYOC

  • A company with offices in multiple countries has different regional carriers in each territory and wants a single, unified phone system across all sites without renegotiating every carrier contract.

  • A business migrating away from a legacy PBX already has a SIP trunk in place and wants to keep it connected to the new system rather than switching carriers at the same time as changing platforms.

  • An organisation with strict regulatory requirements in its sector needs to keep its numbers with a carrier that meets specific national compliance rules, while still benefiting from modern cloud PBX features.

How BYOC works in Voxbi

  1. Add your SIP trunk in the Voxbi Cockpit

    Go to the SIP Carriers section and create a new entry for your provider. You configure the SIP registrar address, SIP credentials, and how the trunk handles incoming caller identification. The setup works with any standards-based SIP trunk.

  2. Route inbound numbers to call flows

    Once the trunk is registered, assign your phone numbers (direct inward dialling numbers) to the call flows you build in Voxbi. From that point on, calls arriving on your carrier's trunk are handled by Voxbi's routing, queues, schedules, and IVR menus.

  3. Configure outbound calling

    Set which trunk (or trunks) Voxbi uses for outgoing calls. Running more than one carrier is supported, so you can use one trunk as the primary path and another as failover, or split traffic by location or business unit.

  4. Test and verify

    Make inbound and outbound test calls to confirm caller identification, audio quality, and routing all behave as expected. The Voxbi Cockpit's call history log shows each call's path so you can verify the trunk is working correctly.

For step-by-step configuration, see the bring your own carrier page in the integrations section.

Frequently asked questions

Which SIP providers work with Voxbi?

Voxbi is fully SIP-compliant, so any standards-based SIP trunk provider can be connected. A number of providers have been certified through the Mixvoip certification programme after full engineering testing; others have been confirmed compatible by customers already running them. If your carrier uses standard SIP signalling, it will work.

Can I connect more than one carrier at the same time?

Yes. You can add multiple SIP carrier entries in the Cockpit and configure Voxbi to use them for different purposes: primary and backup routing, separate trunks for different office locations, or distinct outbound identities by department.

What happens to my existing phone numbers?

Nothing changes on the carrier side. Your numbers remain registered with your carrier and continue to be delivered to your trunk. Voxbi receives the incoming call from that trunk and routes it according to your call flows.

What if my carrier uses ISDN or analog lines rather than SIP?

Voxbi connects over SIP. If your existing infrastructure uses ISDN, PRI, or analog lines, a VoIP gateway can convert the signal before it reaches Voxbi. Mixvoip, as a carrier and equipment supplier, can advise on gateway options if this applies to your situation.

More call routing features

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After call work

Give agents time after each call to tag, log, and prepare before the next conversation.

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Call priority

Move designated VIP callers to the front of the queue automatically.

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Call queues

Handle busy periods by lining up incoming calls and answering them in order.
See all features →

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