VoIP Providers! Take Note of Requirements to Interop With 3CX

3CX supports over 100 different SIP trunk providers globally. Applying and testing to become a 3CX supported VoIP provider is the best way to get your services out in front of 3CX customers and partners. To help you with this, we’ve prepared a technical document with the requirements for becoming a 3CX supported SIP trunk provider.

Technical requirements for VoIP providers

Getting your SIP trunks added to our list of supported VoIP provider pages will take a little work and some specific technical requirements. We break our requirements down into two separate categories:


  • Registration-based trunks
  • rInstance parameter support
  • Allowed IP address list
  • DTMF support for RFC2833
  • Proxy audio
  • Error codes


  • E164 number formatting
  • TLS / SRTP
  • T38 Support
  • SMS / MMS Support

Due to the fact that these categories are relatively lengthy and somewhat complex, we have prepared a breakdown of each point including descriptions and SIP message examples. If you are a VoIP provider and interested in becoming a supported provider, check out our VoIP provider documentation to review the mandatory and optional requirements.

Why become a supported provider?

Imagine getting your name and brand in front of over 600,000 companies. Becoming a supported provider means:

  • Your service will be included in the management console as one of the pre-configured SIP trunks in 3CX.
  • Your company will be listed on our supported VoIP provider pages.
  • We will test each version of our software against your service before release.
  • We will offer first-level support to our partners and customers using your service.

Ready to apply?

Head over to our easy online form to get the ball rolling on an existing new partnership.

Sourced from: 3CX Blog. View the original article here.

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