I Want to Connect My PBX to an AI Voicebot — What Pieces Do I Actually Need?
Map the telecom provider, PBX, call-control interface, media interface, AI service, conversation logic, CRM/RAG, latency, failover and observability needed for a real voicebot.
Telephony architecture & product design · Article 6 of 12
Map the telecom provider, PBX, call-control interface, media interface, AI service, conversation logic, CRM/RAG, latency, failover and observability needed for a real voicebot.
What decision are you actually trying to make?
A voicebot stack needs at least five independent capabilities: carrier/PSTN access, PBX/call control, a media extraction/injection path, the realtime speech/AI service, and application/customer context. Add observability and fallback. If one vendor supplies several layers, keep the conceptual boundaries anyway so latency and failure can be diagnosed.
Separate the layers before comparing products
| Layer or concern | Primary job |
|---|---|
| Provider | PSTN/SIP connectivity |
| PBX | Call legs, route, hangup, transfer |
| Media bridge | Audio frames to/from AI |
| AI service | Speech/model processing |
| CRM/RAG | Business context |
| Fallback | Human/IVR/message when AI fails |
Ask these questions before choosing the implementation
- Map the call path end to end.
- Choose one canonical audio format.
- Define interruption/barge-in behaviour.
- Protect PII/secrets in AI context.
- Test failure of every external dependency.
Follow one call end to end
Production-grade decision rule
How to use this in a real implementation
Use this architecture specifically to test the decision described here: map the telecom provider, pbx, call-control interface, media interface, ai service, conversation logic, crm/rag,…. For every component, name its owner, interface, failure behavior and the evidence that proves it is doing its job.
- Draw signaling and media as separate arrows; they frequently take different paths.
- Name the system of record for customer state, telephony state and configuration state.
- Document what happens when the AI/cloud/application layer is unavailable but an active call still exists.
- Define one observable success criterion per component instead of relying on an end-to-end green status.
Continue from here
After this article: use the next link that matches the unresolved part of map the telecom provider, pbx, call-control interface, media interface, ai service, conversation logic, crm/rag,…. Choose the telephony architecture from the business need · See how MYLO separates AI reasoning from controlled execution
Questions a careful reader usually asks next
Do I need every component shown in the architecture?
Not necessarily. For map the telecom provider, pbx, call-control interface, media interface, ai service, conversation logic, crm/rag,…, keep only components with a named responsibility; a small deployment can combine roles on one host as long as ownership and failure behavior remain explicit.
Does on-premise automatically mean more private?
No. In this design, trace signaling, media, recordings, customer data and AI requests individually. For map the telecom provider, pbx, call-control interface, media interface, ai service, conversation logic, crm/rag,…, privacy depends on those actual paths and controls, not on whether the marketing label says cloud or on-premise.
How should I compare two telephony products?
Compare candidate products against the workload implied by map the telecom provider, pbx, call-control interface, media interface, ai service, conversation logic, crm/rag,…: PBX features, media behavior, integrations, operator skills, scale and recovery. A single overall winner hides the trade-offs this article is trying to expose.
References and further reading
Platform capabilities referenced in I Want To Connect My Pbx To An Ai Voicebot What Pieces Do I Actually Need are linked to official product/project documentation. The architecture guidance is our engineering interpretation of those capabilities and should be validated against the workload you actually run.
- FreeSWITCH Users Manual — authoritative project documentation for the FreeSWITCH behavior/configuration referenced above.
- Asterisk PJSIP configuration relationships — official Asterisk documentation used for the comparison/mapping.
- Asterisk ARI documentation — official Asterisk documentation used for the comparison/mapping.
- Exotel — AgentStream WebSocket protocol — official protocol documentation used only for the documented streaming model.
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