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Self-hosted PBX vs hosted phone

Shared dimensions

ModelEvaluation laneEvidence status
Self-hosted PBXOperator-managed call control using projects such as Asterisk or FreePBXPartial
Hosted phoneProvider-managed calling serviceNot established until provider, region, numbers, and plan are named

Compare number availability/porting, inbound routing, queues, emergency calling, devices, voicemail, recording, messaging, resilience, support, accessibility, compliance, and exit.

Operator profiles

Self-hosting may fit a telephony-capable organization with unusual integration/control needs. Hosted phone usually fits a lean operator wanting provider operations and support. Geography, regulation, carrier availability, and internet resilience can decide the model.

Task coverage

Both can augment reception routing, sales calls, voicemail, opening-hours handling, and escalation. Staff still answer with judgment, verify callers, handle emergencies, protect recordings, and follow up when routing or transcription fails.

Human work remaining

People maintain greetings and schedules, staff queues, review missed calls, approve recordings, handle abuse/fraud, support devices, manage number ports, and operate outage procedures.

Technical difficulty

Self-hosting is high due to SIP, carriers, NAT/firewalls, codecs, quality of service, fraud controls, devices, updates, monitoring, redundancy, and emergency calling. Hosted phone is low-to-moderate but still needs network, identity, device, and carrier-transition work.

True-cost categories

Count software/service, numbers, usage, carrier/SIP trunks, devices/headsets, internet redundancy, implementation, porting, recording/storage, compliance, support, monitoring, fraud, staff time, and exit. Exact prices and free limits are not established.

Portability

Confirm legal control and porting of every number. Retain routing plans, greetings, voicemail and recording policy, contacts, device inventory, call records required by policy, credentials, and a tested transition plan.

Integrations and verification caveat

CRM, help desk, directory, mobile/desktop client, recording, messaging, carrier, and emergency-service integrations are partial until region, number type, direction, identity matching, limits, support boundary, and current official docs are verified.

Security

Restrict international/premium calling, use strong device/admin credentials, protect SIP and portals, monitor fraud, patch, segment voice devices, define recording consent/retention, secure voicemail, and rehearse compromised-account response.

Licensing

Asterisk and FreePBX combine open-source components with project/vendor-specific modules and services; verify every deployed component. Hosted phone is proprietary and governed by service/carrier terms.

Maintenance

Maintain carriers, numbers, routes, schedules, devices, certificates, fraud controls, updates, backups, call-quality monitoring, emergency location data, porting records, and outage diversion.

Scenario recommendations

Test ordinary, unanswered, transferred, queued, after-hours, emergency, blocked, fraudulent, poor network, internet-outage, and provider-outage scenarios. Prefer hosted service unless control needs and telephony expertise justify operating the PBX.

Do not use when

Do not self-host without fraud monitoring, emergency-calling validation, redundancy, and a named telephony owner. Do not sign hosted service before confirming number portability, support boundaries, recording rules, and outage forwarding.

Verification

Verified on 2026-07-18. Regional availability, emergency behavior, features, prices, free limits, and integrations are partial or not established until provider- and site-specific testing.

Official sources