Support / Voice / PBX / 3CX

Add a VoiceTel SIP trunk to 3CX.

3CX has a SIP trunk wizard with templates for many providers. VoiceTel doesn't ship as a named template; use the Generic SIP Trunk template and fill in the fields below.

1. Create the trunk

  1. 3CX Management Console → SIP Trunks → Add SIP Trunk.
  2. In the country selector, pick Generic → Generic SIP Trunk.
  3. Enter a Main Trunk No. — typically your primary VoiceTel-assigned DID (in E.164, e.g. +12125551234).
  4. Click OK to open the trunk-edit form.

2. General tab

  • Enter name for Trunk: VoiceTel
  • Registrar / Server / Gateway Hostname or IP: the SIP server host shown in your customer portal
  • Outbound Proxy: same as Registrar
  • Number of SIM Calls: your provisioned concurrent-call cap (or unlimited if you have an unmetered trunk)
  • Type of Authentication:
    • Digest: select Register/Account based
    • IP auth: select IP based and add the 3CX server's public IP to your VoiceTel ACL
  • Authentication ID: SIP username from VoiceTel onboarding
  • Authentication Password: SIP password from onboarding
  • 3 Way Calling Method: Re-Invite (default)

3. Options tab

  • Disallow video calls: ticked (unless onboarding confirmed video support)
  • Send all calls to default voicemail: unticked
  • Require registration for incoming calls: ticked (Digest) or unticked (IP auth)
  • Re-Invite Mode: Pass-through (default)
  • SIP Reinvite handling: Default

4. Inbound parameters tab

  • Source identification: match by Caller ID if your VoiceTel ACL covers multiple source IPs; otherwise leave default
  • Map your VoiceTel-assigned DIDs to extensions / IVRs / queues here.

5. Outbound rules

  1. Outbound Rules → Add.
  2. Rule Name: Outbound via VoiceTel
  3. Apply this rule to these calls: by length / by prefix per your dialing plan
  4. Make outbound calls on: the VoiceTel trunk
  5. Strip Digits: 0 (unless your dialing plan requires)
  6. Prepend: as needed (e.g. +1 if your extensions dial 10-digit and VoiceTel expects E.164)
  7. Save.

Verify

3CX Management Console → SIP Trunks. The trunk should show Registered within a minute. Check Activity → SIP Trunk for an OPTIONS ping every 30 seconds with 200 OK responses.