How to Set Up MicroSIP with VoxioTelecom (Step-by-Step, 2026)

Want to make calls from your Windows PC through VoxioTelecom without installing a full PBX? MicroSIP is a free, lightweight SIP softphone and works with our SIP trunks in a few minutes. This guide walks you through everything: creating the trunk in the portal, filling in every MicroSIP field, setting your caller ID, and dialing Premium CLI routes.

What you need

• A VoxioTelecom account. Sign up at voxiotelecom.com/auth.
• Balance on your account. Top up in crypto from Portal → Funds.
• MicroSIP for Windows, downloaded from the official site microsip.org.
• A caller ID (CLI) you are allowed to present, in international format, digits only (e.g. 4930901820).

Step 1: Create a SIP trunk in the VoxioTelecom portal

1. Log in and open Portal → SIP Trunks (/portal/sip).
2. Click New trunk.
3. Enter a Label, for example MicroSIP laptop, and click Create trunk.
4. A window shows your credentials: Host, Port, Username and Password. Copy them now. The password is shown only once.
5. Optional: in the Caller ID column, pick how your number is sent: Pass-through (dynamic), Fixed Caller ID or Hide Caller ID. For MicroSIP, leave Pass-through so the number you set in MicroSIP is used.

Step 2: Add the account in MicroSIP

Open MicroSIP, click the small arrow at the top right and choose Add Account. Fill in the fields like this:

Click Save. The status at the bottom of MicroSIP should change to Online.

Why the caller ID goes in the "Username" field

This is the most common mistake. MicroSIP has two separate fields:

• Login is used only for authentication. Put your SIP username from the portal here.
• Username is what MicroSIP writes in the SIP From header. That is the caller ID the destination sees.

VoxioTelecom never overwrites your CLI on pass-through trunks. We send the number MicroSIP puts in the From header. If you put your SIP login in Username, the call goes out with a random string instead of a phone number. Many carriers then reject it or show "unknown". So:

Username = your caller ID (digits only, international format, no +, no spaces). Login = your SIP username from the portal.

To change your caller ID later, just edit the Username field in MicroSIP.

Step 3: Make your first call

Dial numbers in international format without + or 00:

• Standard route: 4915112345678
• Germany Premium CLI: put 1112 before the number: 11124915112345678
• Other Premium CLI prefixes are listed in your rate deck in the portal and in our documentation.

Check the call in Portal → Calls to see duration and cost.

Troubleshooting

• Status stays "Request timeout": check that Transport is UDP and that your firewall allows outgoing traffic on port 5060.
• 403 Forbidden: Login or Password is wrong. Copy them again from the portal, or create a new trunk.
• Call fails right away / 402 or 503: your balance may be too low. Top up from Portal → Funds.
• Destination sees no number: the Username field doesn't contain a valid caller ID. Use digits only.
• One-way audio: enable Allow IP Rewrite and set Public Address to Auto.

Still stuck? Open a ticket from Portal → Support with the number you called, the time and the error code.

FAQ

Is MicroSIP free?

Yes. MicroSIP is free, open-source software for Windows.

Can I use MicroSIP with Premium CLI routes?

Yes. Use the same account and add the tech prefix, e.g. 1112 for Germany Premium CLI.

Where do I put the caller ID in MicroSIP?

In the Username field. Your SIP login goes in Login.

Can I use several caller IDs?

Add one MicroSIP account per caller ID, all with the same Login and Password, and switch between them from the account menu.

Do I need a public IP?

No. VoxioTelecom trunks use username/password, so MicroSIP works behind any home or office router.

Ready to start? Create your account and see our SIP trunk guide.