How to set up 3CX, MicroSIP and Zoiper

Purpose

This article explains how to configure 3CX, MicroSIP, and Zoiper using a device created in the CONTAQT system.

The same credentials are used for all softphones and PBXs.

Step 1: Create a device in CONTAQT

Before configuring any softphone or PBX, you must create a device.

1. Go to Devices

2. Click Create Device

3. Click Save

Once the device is created, all required credentials will be available.

Device credentials (IMPORTANT)

After saving the device, you will see the following information:

• Username
  Format: d followed by numbers
  Example: d12333

• Password
  Displayed on the right side of the username

• Domain / SIP Server
  Format:
  a<account_number>.sip.io

  Example:
  For account 1001 → a1001.sip.io

✅ This information is all you need to configure any SIP device.

How to set up MicroSIP

1. Open MicroSIP

2. Go to Menu → Add Account

3. Fill in:

   • SIP Server / Domain: a1001.sip.io

   • Username: d12333

   • Password: device password

   • Display name: optional

4. Save the configuration

5. Register the account

If configured correctly, the status will show Registered.

How to set up Zoiper

1. Open Zoiper

2. Add a new account

3. Choose SIP account

4. Fill in the correct information for example:

   • Username: d12333

   • Password: device password

   • Domain / Host: a1001.sip.io

5. Save and register

Once registered, the account is ready to make and receive calls.

How to set up 3CX

Create the extension

1. Log in to the 3CX 

2. Right click -> Accounts

3. Click on new

4. Fill the correct information for example:
   
   

   • Username: d12333

   • Password: device password

   • Domain / Host: a1001.sip.ioPress OK -> OK and should appear On Hold.

Common mistakes

• ❌ Using the account number instead of the device username

• ❌ Typing the domain incorrectly

• ❌ Forgetting to save the device before configuring

• ❌ Mixing credentials from different devices

Testing

After configuration:

• Place an outbound test call

• Verify inbound calls (if DID is assigned)

• Check registration status

Summary

To configure 3CX, MicroSIP, or Zoiper, you only need:

• Device username (dXXXXX)

• Device password

• Domain (a<account>.sip.io)

Once the device is created, setup takes less than 2 minutes.