Configuring a Voxtelesys SIP Trunk

Voxtelesys US Sip Trunk Provider

Step 1: Sign up and create your SIP Trunk

  1. Sign up to the Voxtelesys website.
  2. On the “Configure Services” screen, select “3CX''. 
  3. Find the SIP trunk authentication details under “SIP Registrations”.
  4. Your credentials should be listed under “3cx.pstn.voxtelesys.net”.

Step 2: Configuring your SIP Trunk with 3CX

  1. Go to the 3CX Web client and follow the guide on how to configure a SIP trunk.
  2. Enter the main trunk number and DIDs in the E164 number format, for example if your number is (888)-233-5678, it should be entered as +18882335678

Step 3: Optional: Configure SMS/MMS

If you wish to send SMS or MMS via your SIP trunk, then you must configure a number for messaging:

  1. Login to Voxtelesys portal.
  2. From the left sidebar select “Channels → Messaging →  Messaging Application” and click on Add messaging Application.
  3. Fill in the form as required and click “Confirm”:
  1. Profile Name: Enter the name of the application profile, e.g. “3CX”
  2. Trunk Group: Select your trunk group from the dropdown menu
  3. Action Type: Select “Send HTTP Callback
  4. HTTP Method: POST
  5. Events: Both
  6. MO Webhook: Webhook URL from 3CX
  7. DR Webhook: Webhook URL from 3CX
  8. Authentication - None
  1. Now Go to “Products > APIs > API Keys” > Create Key”.
  2. On the form check on the ‘Enable” option and enter a name for the key.
  3. Click “Save” and take note of the newly created key. This is the key that will be used to complete the integration with the 3CX Messaging.

Step 4: Optional: Configure the SMS/MMS Number

number configuration settings for sms in voxtelesys

  1. Now configure the number. Go to “Phone Numbers > Numbers”.
  2. Choose the number you want to configure with 3CX and click edit.
  3. In the form, “Number” and “Trunk Group” are pre-populated, you need to set the following:
  1. Route Type: Standard routing
  2. Route Profile: 3CX - Registration
  3. SMS Enabled
  4. Service Trunk: the trunk the number is associated with
  5. Messaging Application: choose the messaging application you created in step 1
  6. Campaign: The 10DLC campaign you created (pre-requisite).

Step 5: Optional: TLS setup

Voxtelesys trunks support SIP over TLS which can be enabled as follows:

  1. From the 3CX Web Client go to “Admin > Voice & Chat”.
  2. Choose your Voxtelesys SIP trunk .
  3. Navigate to the “Options” tab and under the option “Transport Protocol” choose “TLS”.

Optionally, you can enable “SRTP”. To do so:

  1. Contact Voxtelesys so they can also enable it from their end for your trunk.
  2. Once done, navigate to the “Options” tab of your trunk and select “Enforced” under “SRTP Mode”.

Your communication will be completely encrypted.

About Voxtelesys

Voxtelesys offers advanced voice, data, routing, and compliance services as well as exceptional customer service all at a low cost. They deliver a reliable trunk availability that is changing the on-size-fits-all service bundles that offer too little and cost too much.

Last Updated

This document was last updated on 18 June 2026

https://www.3cx.com/docs/sip-trunk/voxtelesys-usa/

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