How 3CX Inbound Call Routing Works
When a customer calls your business number, the call arrives through a SIP trunk and 3CX needs to determine where it should go. The platform checks the number the caller dialled against the DIDs configured in your SIP Trunk settings. Once a matching DID is found, 3CX can send the call to the right extension, call queue, IVR menu or other destination.
A DID is the public number that represents a specific service point in your business. A Queensland company might use separate DIDs for reception, sales and support, with each number following a different call flow. Keeping those numbers mapped to their intended destinations makes inbound routing easier to manage and troubleshoot.
Why the Dialled Number Matters
The first step in a reliable setup is confirming that every public number is listed accurately in the relevant SIP Trunk settings. If a customer calls an advertised support number and 3CX cannot find a matching DID, the call may follow an unexpected route or fall through to the default destination.
Create a simple register showing each public number, the SIP trunk it arrives on and the destination it should reach. Review it whenever you add a campaign number, a new department or an additional business location.
The Matching Process in 3CX
Inbound routing is based on more than the dialled number alone. 3CX also checks information used to identify the source of the call, including source identification, the rinstance match, the Contact User Part, the Auth ID and the Call Source Identification criteria. After that source-identification process, the CalledNum value is matched against the DIDs on the relevant trunk.
In practical terms, the sequence is:
- 13CX identifies the SIP trunk or provider that delivered the call.
- 2It checks whether the CalledNum value matches a DID configured on that trunk.
- 3The matching inbound route sends the call to its destination.
- 4If no specific DID match exists, the call follows the default route.
Inbound Rules and Default Routes
Once a DID has been identified, inbound rules determine where the call goes. If a call lands in the wrong place, the inbound rules report is a useful starting point. It can show whether the DID matched a specific destination or whether the call fell through to the default route.
The default route is an important safety net. If a new number is connected but no dedicated inbound rule has been created, the default route catches the call. That might send callers to reception, a general queue or a voicemail box. It is still best practice to create a specific rule for each DID so that important calls do not reach the wrong team.
3CX Version 20 and Inbound Rules
3CX Version 20 introduced a refreshed management interface, and administrators may find that routing settings are presented differently from earlier deployments. If you are upgrading an existing system, allow time to review where the relevant settings now live and confirm that your previous routes translated correctly.
Menu names and locations can change between releases. Always check the current 3CX documentation for the version you are running, and test each public number after a major system change.
Routing Calls to an IVR by Office Hours
Many Queensland businesses need one call flow during business hours and another after hours. During the day, callers might hear an IVR that offers sales, support or accounts. Outside those hours, the same number could route to voicemail, an on-call mobile or a message explaining when the office reopens.
For this to work reliably, define your business hours correctly in 3CX and link the inbound routes to the correct destinations for each period. Office status is not just a cosmetic setting: if 3CX believes the office is closed, it can skip the business-hours path entirely.
If callers hear an after-hours message during normal trading hours, check the system status and schedule first. Then review the affected DID and confirm which business-hours and out-of-hours destinations are active.
Routing by Caller ID with Call Scripts
Inbound routing does not have to depend only on the number being called. 3CX can also route calls based on the caller’s own number. This can help a business give recognised customers priority treatment or send known contacts to a specialist team.
The Inbound Caller ID routing script can be added from the 3CX Admin Console under Integrations and Call Scripts. After selecting Add from Store, choose the relevant inbound caller ID routing option and configure the destinations. This approach can send known contacts to one queue, new callers to a general queue and anonymous callers to a recorded message.
Troubleshooting Common Routing Problems
Calls Are Treated as If the Office Is Closed
Check the current system status and business-hours schedule first. Then verify the inbound rule or default destination for the affected DID and use the inbound rules report to trace what happened.
Callers Stop Hearing the IVR
If calls work initially but the IVR later stops playing, review office status, tenant or extension settings and any route that depends on a condition. Trace the call from the activity log and confirm what 3CX believes about the current time and destination.
Calls Are Sent to the Wrong Team
Confirm that the caller’s number is configured as a DID on the correct SIP trunk and that a dedicated inbound rule points to the intended destination. If no specific match exists, the default route may be handling the call.
Use the Activity Log to Trace Calls
The 3CX activity log shows what happened as a call moved through the system. It can reveal whether the call matched an intended rule, followed an office-hours condition or fell through to the default route. Reviewing the log before changing settings helps prevent troubleshooting by guesswork.
Build a Reliable Routing Strategy
Start by listing every public number customers can use, including local geographic numbers, service numbers and temporary campaign lines. Map each number to the team or department that should answer it, then decide what should happen when that team is busy or unavailable.
Document every route so future changes can be made confidently. When a staff member leaves or a department changes, update the relevant routing rules at the same time. Keep a sensible default destination in place so a new or unlisted DID never leaves a caller at a dead end.
For businesses that need hands-on assistance, ClearCall provides [3CX phone systems](/business-phone-solutions), [SIP trunking](/sip-trunks), business internet and managed support across Queensland. Our Toowoomba team can review an existing setup, plan the call flow and configure routing around the way your business actually operates.
Frequently Asked Questions
What Is the Default Destination for Calls in 3CX?
An inbound call that cannot be matched to a specific DID or rule is sent to the default route. This catch-all destination might be reception, a general queue or voicemail. The inbound rules report can show whether a call used a specific route or fell back to the default destination.
Can I Route Calls Differently During Business and After Hours?
Yes. 3CX can send the same number to different destinations depending on whether the office is open. A typical setup sends daytime callers to an IVR or reception queue and after-hours callers to voicemail or an on-call mobile. The business-hours schedule must be configured correctly.
Can 3CX Route a Call Based on the Caller’s Number?
Yes. The Inbound Caller ID routing script can evaluate the caller’s number and send the call to a selected destination. It is available from the Admin Console under Integrations and Call Scripts.
Why Does My 3CX System Behave as Though the Office Is Always Closed?
The office status or schedule is usually the first place to look. Check the current system status and business hours, then confirm that the affected DID points to the intended business-hours destination rather than the after-hours path.
What Happens When a DID Has No Inbound Rule?
If the CalledNum value matches a DID but no inbound rule is linked to it, 3CX uses the default route. Adding a dedicated rule for each DID prevents calls from reaching the wrong team.
Get Help with 3CX Inbound Call Routing
A well-planned inbound call flow helps customers reach the right person quickly and gives your team a predictable way to handle busy periods, after-hours calls and new numbers. If you would like help reviewing your 3CX configuration, [contact ClearCall](/contact) for guidance from a Toowoomba-based 3CX specialist.