Assessment, not assumption
Every system is reviewed on its own terms. If a supported path does not exist, we say so rather than working around it.
OTHER PHONE SYSTEMS
Already Have a PBX? Connect It to VoxLink.
Your phone system is not on our list of named pages - that does not mean it cannot be assessed.
Most businesses in this position have been told the only way to add AI voice is to move their numbers to a new platform and rebuild the routing they already trust.
If your PBX supports compatible SIP connectivity, a dedicated extension or supported SIP connection may be able to bridge selected calls to a VoxLink AI agent.
We assess before we promise. Compatibility depends on your PBX, its SIP architecture, authentication, network configuration and routing requirements.
Answer calls, book appointments, qualify leads, handle enquiries and connect customers with your team - 24/7.
Connection
Other Phone Systems + VoxLink
- Connection type
- SIP
- Routing
- Selected call flows
- Direction
- Inbound + outbound
- Validation
- Tested before go-live
Keep your phone system. Keep your numbers. Add AI to the conversations you choose.
Compatibility
Can VoxLink Connect to My SIP Phone System?
The connection model is SIP-based, so the question is always whether your specific system can present a compatible SIP registration or trunk connection to VoxLink, and whether your network and routing allow it. That is a per-deployment answer, not a product claim.
We do not say VoxLink works with any PBX, and we do not publish a compatibility list for systems we have not explicitly verified. What we do is assess yours: the PBX and version, the SIP architecture available to it, the authentication model, the network and firewall conditions, and the call routing you actually want.
SIP capability is the deciding factor
A compatible SIP registration or trunk connection has to be available and permitted on your PBX for this model to apply.
Your PBX stays in place
Where a path exists, your existing system continues to own the numbers, users and routing while selected calls reach the AI.
What VoxLink adds
What You Can Automate With Other Phone Systems
Selected inbound answering
Where compatible, a chosen route reaches AI while the rest of the PBX behaves normally.
After-hours cover
Where routing allows, out-of-hours calls can be answered instead of going to voicemail.
Overflow handling
Where your PBX supports an overflow or no-answer destination, that path can reach AI.
Booking and qualification
Capture bookings and qualify enquiries on compatible call paths.
Transfer back to your team
Where the transfer method is supported by your PBX and validated in testing.
Inbound and outbound
The SIP model supports both when authentication, network access and routing are configured correctly.
In practice
Example Call Flow
The general shape of a compatible SIP-based connection, in plain language.
- 01
A customer calls your existing business number.
- 02
Your PBX receives the call and applies your current routing rules.
- 03
A rule you configure sends selected calls over a compatible SIP connection to VoxLink.
- 04
The AI answers, handles the conversation and captures the outcome.
- 05
The call completes, or transfers back to your team where that routing is supported.
CallerNobody's picking up - I need a quote for a job next week.
VoxLink AII can take the details now. What's the job, and where is the site?
CallerFence replacement, about 30 metres, in the northern suburbs.
VoxLink AIGot it. I've logged the scope and your contact details, and the estimator will call you back with a quote.
Outcome: a quote request captured that would otherwise have rung out.
Positioning
One AI Platform. Many SIP-Based Phone Systems.
VoxLink's SIP connection model is designed for businesses that want to keep their current phone system. A dedicated PBX extension or supported SIP connection can bridge selected calls between the existing phone environment and a VoxLink AI Agent.
There is no charge to establish whether a supported path exists, and no requirement to change your existing phone system contract.
See VoxLink pricing and plans →Your existing PBX and the way it routes calls today.
Your current numbers, trunks and provider arrangements, where routing permits.
Your extensions, users and internal call flows.
The decision about which calls are sent to AI - for example after hours, overflow or one dedicated number.
Use cases
Compatible SIP / PBX Use Cases
General scenarios, each subject to the compatibility assessment for your system.
- Where compatible, send after-hours calls to AI rather than voicemail.
- Where your PBX supports it, route overflow or no-answer calls to AI.
- Point one dedicated number or call path at AI while the rest is unchanged.
- Qualify enquiries and capture details before a person is involved.
- Book or reschedule appointments during the call.
- Transfer callers back to your team where the transfer method is supported and tested.
Technical model
How the Connection Works
For PBX-extension integration, the connection typically uses an extension number, extension username/password and PBX server address. The credentials configured in VoxLink must match the PBX. The connection can support inbound and outbound calling when the PBX, network and routing are configured correctly.
Existing Number
Your PBX
SIP Extension / SIP Connection
VoxLink AI Agent
Customer / Team
This page focuses on the PBX-extension concept. Our technical team can also assess alternative direct-number or SIP-provider architectures for your deployment.
Requirements
What You'll Need
Gathered privately with your administrator. Extension IDs, usernames, passwords and server addresses are never published on this site.
- Confirmation that your PBX supports compatible SIP registration or trunk connectivity.
- Administrative access to the phone system.
- The ability to create a dedicated SIP extension, account or approved SIP connection.
- Agreement on which inbound calls should be routed to the AI.
- Appropriate network, firewall and NAT configuration for SIP signalling and audio.
- Outbound routing and caller-ID arrangements if outbound workflows are in scope.
- A VoxLink account and an authorised administrator available for testing.
Setup
Compatibility & Setup Steps
Our team works through this with you. No configuration details, credentials or server addresses are ever published.
- 1
Confirm the PBX supports compatible SIP registration or trunk connectivity.
- 2
Create a dedicated SIP extension/account or an approved SIP connection.
- 3
Gather the extension/account ID, username/password and PBX or SIP server address.
- 4
Configure the matching SIP connection in VoxLink.
- 5
Route selected inbound calls.
- 6
Configure outbound routing and caller ID if required.
- 7
Test inbound, outbound, audio, DTMF, transfer and failover.
Before go-live
Every Connection Is Tested First
Compatibility and call quality are confirmed on your environment before customers reach the AI.
- SIP registration or trunk connectivity
- Inbound and outbound audio in both directions
- DTMF handling
- Transfers back to your team
- Caller ID presentation
- Firewall and NAT behaviour
- Failover when the AI path is unavailable
Use it with
What to Set Up After Connecting Other Phone Systems
Other phone systems
Connect a Different System
Not sure what you have?
Send us your phone system details and we'll confirm whether a supported SIP connection is available.
Request a compatibility check →FAQ
Other Phone Systems Questions
Don't See Your Phone System? Let's Connect It.
Tell us which PBX you use. If it supports compatible SIP connectivity, we'll help determine the best way to connect it to VoxLink.