Second SIP trunk as failover for the main provider.
A second trunk at a different provider reduces single-point-of-failure risk. The PBX can fail outbound over automatically, and inbound failover via porting or via failover routing in DNS/ENUM.
Try this first
- 1Order a second trunk at a different provider (not the same upstream carrier).
- 2PBX outbound rules: primary first, secondary as fallback on signalling error.
- 3Inbound failover: have the provider forward to a secondary number when primary is unreachable.
- 4Test monthly, otherwise you only learn during an outage.
When to bring us in
Both trunks use the same physical uplink: failover is fake assurance, you also need a second WAN.
See also
- Voys, BelXS or RoutIT, which cloud PBX fits?Three popular NL platforms, differences are admin UI, partner model and per-user price.
- Teams Phone: Calling Plan, Direct Routing or Operator Connect?Three ways to connect PSTN to Teams, cost and management differ a lot.
- 3CX: self-host on VPS or take 3CX cloud?Self-host saves licence, but you own SBC, backup and updates.
None of the above fits?
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