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3CX is a supported BYOS setup. The following steps show how to route calls from a 3CX phone system to Miyon AI. Inbound calls travel from your provider through 3CX to Miyon AI, where a voice agent answers.

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Requirements

You need administrator access to the 3CX Admin Console and the SIP feature enabled in Miyon AI. In the platform, set up the inbound SIP trunk and a custom phone number assigned to an agent. Have your personal SIP address ready for the trunk configuration.
These steps use an example phone number +499999999999, an internal 3CX prefix 999, and the resulting dial string 999+499999999999. Replace them with your own values.

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1. Create a SIP trunk

In the 3CX Admin console, open Trunks & Chat, click + Trunk, and choose Generic SIP Trunk (IP Based). Creating a generic SIP trunk in 3CX

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2. Enter the trunk data

  • Main trunk number: your phone number from Miyon AI, for example +499999999999.
  • Authentication type: None – IP based.
  • Registrar/Server: your personal SIP address from Miyon AI, without the sip: prefix:
Do not include the sip: prefix in the Registrar/Server field. Otherwise Miyon AI responds with 400 Bad Request.

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3. Allow calls back to 3CX

In the trunk configuration:
  • Enable Inbound calls and Outbound calls.
  • Enable PBX delivers audio.
  • Enable Allow carrier-side forwarding (SIP REFER) if you use transfers.
Enabling inbound, outbound and SIP REFER on the 3CX trunk

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4. Create an outbound rule

Create an outbound rule that sends the internal prefix to the Miyon AI trunk:
  1. Set the prefix to 999.
  2. Set Route 1 to the Miyon AI trunk.
  3. Under Strip digits, remove the first 3 digits.
Creating the outbound rule in 3CX

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5. Forward the inbound number to Miyon AI

Open the existing 3CX trunk that receives your real phone number.
  1. Set the default route to Forward to external number.
  2. Set the external number to 999+499999999999 — the internal prefix followed by your number.
Forwarding the inbound number via the internal prefix

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6. Make a test call

Call the phone number that arrives via 3CX. The call should reach Miyon AI on the assigned voice agent. If it does not, check first:
  • Does the outbound rule use prefix 999, strip 3 digits, and Route 1 to the Miyon AI trunk?
  • Does the Registrar/Server field contain the SIP address without the sip: prefix? A sip: prefix causes 400 Bad Request.
  • Is the default route of the existing 3CX trunk set to forward to 999+499999999999? Otherwise the call may land in the 3CX mailbox.
  • If 3CX reports “Call forbidden by administrator”, allow the country code under Admin → Advanced → Allowed Country Codes.
  • If Allowed Source IPs / CIDRs is set in Miyon AI, allow the public IP address of your 3CX system.
  • For transfers to colleagues, use a 3CX extension or ring group as the target first.