IP PBX software
Resonance Telcom SIP trunks for 3CX
Pair the 3CX phone system with Resonance Telcom SIP trunks for reliable calling and numbers you manage yourself.
About 3CX
3CX is a software-based business phone system that runs on Windows or Linux servers, on a virtual machine, or as a hosted instance. It is popular with small and mid-sized businesses for its web management console and softphone apps.
Like any standards-based IP PBX, 3CX connects to outside phone lines through SIP trunks, which makes it a natural fit for Resonance Telcom.
Why Resonance Telcom for 3CX
- Standard SIP configuration: enter our connection settings as a generic SIP trunk and you are ready to test.
- Add channels and numbers from our portal as your 3CX deployment grows, without changing the trunk setup.
- Engineers who can help with codec, NAT and firewall questions specific to 3CX.
Connection settings for 3CX
Use these values when you add Resonance Telcom as a SIP trunk. Your account-specific credentials and number assignments are provided when your account is activated.
| SIP server / registrar | sip.resonancetelcom.example |
|---|---|
| Port | 5060 (UDP/TCP), 5061 (TLS) |
| Transport | UDP, TCP or TLS |
| Codecs | G.711u, G.711a, G.729 |
| Authentication | SIP registration or IP authentication |
How to configure 3CX
3CX setup guide in progress
Step-by-step instructions for 3CX are being finalized. Contact us and an engineer will walk you through setup.
3CX FAQs
Which 3CX editions work with Resonance Telcom?
Any 3CX edition that supports generic SIP trunks can connect. Contact us with your version and we will confirm the settings.
Do I need a public IP address for 3CX?
Not necessarily. Registration-based trunks work behind NAT when your firewall is configured correctly. We can review your setup with you.
Ready to move your phones to SIP?
Tell us about your phone system and how many calls you handle. We will put together a plan that fits.