3CX Caller ID Setup

Caller ID Setup:

Standard Configuration

Step 1: Log In to 3CX. Access the 3CX Management Console using your administrator login.

Step 2: Navigate to SIP Trunks.

• Go to the SIP Trunks section.

• Select the SIP trunk used for outbound calls.

Step 3: Edit Outbound Parameters

• Click on the selected trunk.

• Open the Outbound Parameters tab.

Step 4: Update Caller ID Fields

- Set the following fields:

○ From: Display Name →OriginatorCallerID

○ From: User Part →riginatorCallerID

This setting ensures that the forwarded call retains the original caller’s number.

Caller ID for Multiple Phone Lines If you're using multiple SIP trunks:

Step 1: Log In to the Management Console As above, sign in with your admin credentials.

Step 2: Apply Settings to Each Trunk

● Go to SIP Trunks.

● Repeat the steps below for each active trunk.

Step 3: Configure Caller ID for Each Trunk

● Open the Outbound Parameters tab. ● Set:

○ From: Display Name →riginatorCallerID

○ From: User Part →riginatorCallerID

Step 4: Save & Apply ● Click OK or Apply to save changes.

● Restart SIP services if required for the changes to take effect.

Forwarding & Routing Settings

If you're using Extensions, Ring Groups, or Call Queues:

● Check forwarding rules to ensure they preserve the original caller ID.

● Avoid settings that replace the Caller ID with an extension or main number.

⚠ SIP Provider Requirements

Some SIP providers do not allow external numbers as Caller ID. If the original number isn’t showing:

● Contact your provider to verify:

○ They allow custom caller IDs.

○ They support P-Asserted Identity or Remote-Party-ID headers.

Troubleshooting Guide

1. Verify Trunk Configuration

● Ensure both Display Name and User Part are set toorCallerID.

2. Confirm Provider Support

● Your SIP provider must allow third-party Caller ID passthrough.

3. Keep 3CX Up to Date

● Make sure you're using the latest version for compatibility and security.

4. Check Forwarding Rules ● Avoid using rules that override Caller ID during routing.

5. Firewall & NAT Settings ● Incorrect firewall settings can block SIP headers.

● Run the Firewall Checker via:oard → Firewall .

6. Review SIP Logs or Use Wireshark

● CheckDashboard → Activity Log → Verbose Mode .

● Use Wireshark to inspect SIP INVITE packets for Caller ID content.

7. Examine Routing Logic

● Review call flows (queues, IVRs, etc.) to ensure Caller ID isn’t modified.

8. Test with an Alternate SIP Trunk

● Temporarily route calls through a different trunk to isolate the issue.

9. Refresh the Console - Clear your browser cache or restart the console interface to reflect changes.

10. Reboot 3CX Services

● After major configuration updates, restart 3CX services to ensure settings are applied.

Need More Help?

Still not seeing the original caller ID?

● Re-check trunk and extension settings

● Verify SIP trunk capabilities with your provider

● Consult a 3CX-certified technician if the issue persists