PBX/SIP Integration for AI Voice Agents
AI voice agents on your existing phone system.
We connect voice agents to your PBX and SIP trunks, so calls keep routing through the numbers and infrastructure you already run, not a bolted-on new line.
Why Choose GetAIChatBots for PBX/SIP Integration
PBX/SIP integration connects an AI voice agent to the phone system you already run, so callers dial the same numbers and your team keeps its extensions. GetAIChatBots configures SIP trunks, places the agent inside your call routing and builds the transfer and failover rules around it. We work with on-prem and cloud PBX systems, test them under load before launch and monitor uptime afterward, with clients across the US and worldwide.
A voice agent on a separate number is a second phone system.
Most voice agents ship with their own number and their own routing. Your customers already know your main line, and your team already works inside your PBX. Splitting the two means lost transfers, confused callers and twice the admin.
- Customers told to call a different number
- Transfers that drop the caller
- Two systems to monitor and maintain
Three steps from call to launch.
Review the phone stack
We document your PBX, trunks, extensions and current call flows, and confirm compatibility before promising anything.
We read through your setup with your IT or telecom team and test what can be tested without changing anything. You get an honest answer on what is possible before any build begins.
- PBX, trunks and extensions documented
- Current call flows mapped
- Compatibility confirmed in writing
Connect and route
SIP trunks are configured and the agent is placed inside your routing, with clear handoff rules for each call type.
Trunks are set up in a test environment first, then moved into your live routing. Each call type gets its own rule for when the agent answers and when a person does.
- SIP trunks configured
- Routing rules per call type
- Handoff rules agreed with you
Test and monitor
We test transfers, failover and peak load, then monitor uptime after launch and alert you and us at once if something fails.
Tests cover transfers, busy lines and what happens when the agent is unavailable. After launch, uptime checks run all the time and alerts reach both teams.
- Transfer and failover tested
- Peak-load test before launch
- Uptime alerts to both teams
What you get.
SIP trunk configuration and testing
The connection between your phone system and the agent, set up and proven.
- Trunk and credentials configured
- Codec and security settings checked
- Test calls in both directions
On-prem or cloud PBX integration
Works with the phone system you already own, hosted on site or in the cloud.
- Compatibility reviewed first
- Minimal change to your setup
- Notes for your telecom team
Call routing and IVR handoff logic
Clear rules decide which calls the agent takes and which go to people.
- Rules by time, queue or caller
- IVR option leading to the agent
- Fallback if no one answers
Warm transfer to live extensions
A transfer that tells the person what the caller needs before they speak.
- Transfer to extensions or queues
- Summary before the handover
- Caller never repeats themselves
Failover path if the agent is unavailable
If the agent is down, calls still reach your team.
- Automatic fallback routes
- Voicemail or backup number
- Tested before launch
Uptime monitoring and alerts
You hear about a problem as it starts, not when a customer complains.
- Constant uptime checks
- Alerts to you and us
- Monthly health summary
A voice agent that never leaves a caller in silence
A phone line has no tolerance for downtime. We design the call path so that if the agent, the trunk or a downstream service fails, the call falls back to your team, a queue or voicemail instead of ringing out. Warm transfers pass the caller to a live extension together with a short summary, so nobody repeats themselves. We test transfers, failover and busy-hour load before go-live, and monitoring alerts both you and us when call quality or availability changes. Recording and consent notices are configured to match the rules that apply to your calls.
Book a Call ↗Plug the agent into the phone system, not around it.
A PBX is the system that routes your company’s calls between lines and extensions, and SIP is the standard protocol used to connect it to voice carriers and to other systems over the internet. PBX/SIP integration means the AI voice agent registers as part of that routing: calls come in on your existing numbers, reach the agent when you decide, and transfer to extensions when a person is needed. It is plumbing, and getting it right is what makes an AI receptionist feel like part of your business.
What we connect
On-prem and cloud PBX systems over SIP trunks, with the routing and IVR handoff logic that decides which calls reach the agent and which go straight to people.
What you keep
Your numbers, your extensions and your carrier relationships. Callers dial what they already know, and your team keeps working inside the PBX.
Works with your stack.
We connect the voice stack to your PBX over SIP and link outcomes into your CRM. Compatibility is confirmed during the review, before any build starts.
Book a Call →Where PBX/SIP integration fits best.
It fits teams that already run a PBX and answer many calls, such as PBX integration for call centers, medical practices, hotels and security installers.
Three tiers for your PBX and SIP setup.
Keep the numbers and phone system you already run and add an AI agent on top. Every package is a fixed scope, quoted in 24 hours.
Starter
One number, one agent, tested end to end.
- Review of your current phone stack
- 1 SIP trunk or number connected to the agent
- Basic call routing
- Test calls on your own numbers
- Handover documentation
Growth
Most chosenFor teams with a PBX and live extensions.
- On-prem or cloud PBX integration
- Call routing and IVR handoff logic
- Warm transfer to live extensions
- Failover path if the agent is unavailable
- Uptime monitoring and alerts
Enterprise
Voice infrastructure across sites and teams.
- Several sites, trunks and extension groups
- Routing by queue, opening hours and caller intent
- Call recording, transcripts and CRM logging
- Redundant failover and escalation rules
- Load testing before go-live and priority support
AI cold-caller booking 30+ viewings a month
An Austin real estate team wanted its expired listings worked without tying up an agent. We built a voice agent on Bland.ai and GoHighLevel that calls expired listings, books showings and hands hot leads to a human agent. It books 30+ viewings a month at a 72% book rate, around the clock. It shows the voice-agent side of the work: an AI agent calling and booking appointments, which PBX/SIP routing then connects to an existing phone system.
Voice integration built around the phone system you have.
Choosing a PBX integration partner comes down to risk: will calls keep flowing if something fails, and will the work fit your existing system? We work from our Austin, TX and Pakistan offices with clients across the United States and worldwide.
Review before promise
We document your PBX, trunks and call flows first and confirm compatibility, rather than assuming every system behaves the same.
Failover is part of the scope
Every build includes a fallback path, tested before launch, so a problem with the agent does not become a problem for callers.
Monitored after go-live
Uptime monitoring and alerts reach you and us together, and the routing is documented so your IT team can follow it.
Often built together.
AI Agents & Voice
Sales agents, support agents, voice receptionists and appointment setters that book calls and qualify leads around the clock.
- Voice & chat sales and support agents
- Books qualified calls into your CRM
- Scores and routes leads automatically
- Escalates to a human on intent
RAG Pipeline Architecture
We design and build the retrieval layer behind your AI agents, connecting them to your real business data so answers are accurate, not generic.
- Data source mapping & ingestion
- Vector database setup & tuning
- Retrieval accuracy testing
- Ongoing monitoring & re-indexing
Security Audits
An independent review of your chatbot, agent and automation stack: data handling, access control and failure modes, before or after launch.
- Data flow & storage review
- Access control & credential audit
- Failure-mode and fallback testing
- Written report with prioritized fixes
Business Automation
n8n, Make, Zapier and Pabbly workflows that connect your tools and take repetitive work off your team.
- Workflow, CRM and sales automation
- Two-way sync between your systems
- AI steps for triage and drafting
- Error alerts, retries and logging
AI Chatbot Development
WhatsApp, Instagram, Messenger, web, SMS and voice bots that sell, support and qualify 24/7, built on the Static / Dynamic / Hybrid model.
- Static, Dynamic and Hybrid models
- GPT and Claude answering layer
- Lead capture synced to your CRM
- Human handoff on buying intent
CRM Development
GoHighLevel, HubSpot, Zoho and Salesforce builds wired to your stack: pipelines, automations and integrations a setup assistant cannot deliver.
- CRM setup, migration and cleanup
- Custom funnels, fields and pipelines
- API and webhook integrations
- White-label and SaaS-mode portals
Marketing Automation
Automated nurture sequences, lead scoring and campaign triggers that run without a marketing ops hire.
- Lead scoring & segmentation setup
- Multi-channel nurture sequences
- CRM-triggered campaigns
- Reporting dashboard handover
No-Code Development
We build on no-code and low-code platforms so you can maintain and extend what we ship without needing a developer on staff.
- Built on tools your team can actually edit
- No vendor lock-in to custom code
- Faster iteration than a full custom build
- Handover training included
What founders & agencies say.
We were losing patients every lunch hour and after 5 PM. Now the voice agent answers every call, books straight into our calendar, and sends reminders. Our front desk finally gets to focus on the patients in the chair.
Leads used to wait hours for a reply, and by then they’d called another agent. The chatbot qualifies buyers in under a minute and drops them into our CRM with budget and timeline already filled in.
Our office was buried in service requests and callbacks. Now emergencies get routed to the on-call tech instantly and routine jobs book themselves. It’s like we hired two dispatchers.
Most of our bookings start in Instagram DMs, and we couldn’t keep up. The bot answers pricing questions, books consultations, and even suggests add-on treatments. Our DMs actually make money now.
Leads used to wait hours for a reply, and by then they’d called another agent. The chatbot qualifies buyers in under a minute and drops them into our CRM with budget and timeline already filled in.
Our office was buried in service requests and callbacks. Now emergencies get routed to the on-call tech instantly and routine jobs book themselves. It’s like we hired two dispatchers.
Most of our bookings start in Instagram DMs, and we couldn’t keep up. The bot answers pricing questions, books consultations, and even suggests add-on treatments. Our DMs actually make money now.
We were losing patients every lunch hour and after 5 PM. Now the voice agent answers every call, books straight into our calendar, and sends reminders. Our front desk finally gets to focus on the patients in the chair.
Our office was buried in service requests and callbacks. Now emergencies get routed to the on-call tech instantly and routine jobs book themselves. It’s like we hired two dispatchers.
Most of our bookings start in Instagram DMs, and we couldn’t keep up. The bot answers pricing questions, books consultations, and even suggests add-on treatments. Our DMs actually make money now.
We were losing patients every lunch hour and after 5 PM. Now the voice agent answers every call, books straight into our calendar, and sends reminders. Our front desk finally gets to focus on the patients in the chair.
Leads used to wait hours for a reply, and by then they’d called another agent. The chatbot qualifies buyers in under a minute and drops them into our CRM with budget and timeline already filled in.
Most of our bookings start in Instagram DMs, and we couldn’t keep up. The bot answers pricing questions, books consultations, and even suggests add-on treatments. Our DMs actually make money now.
We were losing patients every lunch hour and after 5 PM. Now the voice agent answers every call, books straight into our calendar, and sends reminders. Our front desk finally gets to focus on the patients in the chair.
Leads used to wait hours for a reply, and by then they’d called another agent. The chatbot qualifies buyers in under a minute and drops them into our CRM with budget and timeline already filled in.
Our office was buried in service requests and callbacks. Now emergencies get routed to the on-call tech instantly and routine jobs book themselves. It’s like we hired two dispatchers.
Answers, before you book.
Quick answers to the questions we hear most about PBX/SIP integration.
Do we have to change our phone numbers?
No. The agent sits inside your existing routing, so callers keep dialing the numbers they already know.
Does this work with an on-prem PBX?
Yes. We integrate with on-prem and cloud PBX systems over SIP and confirm compatibility during the review, before any build begins.
What happens if the agent goes down?
A failover path sends calls to your team or voicemail, and monitoring alerts you and us at once, so callers are not left ringing out.
Can calls be transferred to a live person?
Yes. Warm transfer sends the caller to a live extension together with a summary of the conversation, and you choose which call types always go to a person.
What about call recording and consent?
We configure recording notices and consent capture to match the rules that apply to your calls. Which rules those are depends on where you and your callers are, so we suggest confirming with your counsel.