VOIP.SO
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Connect your first softphone

Take the credentials from your portal and register a softphone in about two minutes.

Every VOIP.SO account is issued a SIP extension the moment it is created. You will find the four values you need under Portal → Extensions.

What you need

  • Username — your extension number, for example 1001
  • Domain — your tenant domain, for example acme.voip.so
  • Password — the SIP secret, hidden until you press Reveal
  • Server — sip.voip.so, port 5060 for UDP or TCP, 5061 for TLS

Zoiper

  1. Open Settings → Accounts → Add account and choose manual configuration.
  2. Select SIP as the account type.
  3. Enter your extension as the user, your SIP secret as the password, and your tenant domain as the domain.
  4. Under Network, set the outbound proxy to sip.voip.so.
  5. Save. The account shows as registered within a few seconds.

Linphone

  1. Choose Use a SIP account rather than a Linphone account.
  2. Username is your extension, domain is your tenant domain, and the transport should be TLS if your network permits it.

If it does not register

Check the registration status shown next to the extension in your portal. Unreachable means we can see the account but your device is not answering — almost always a firewall blocking UDP 5060, or a typo in the domain. Switching the transport to TLS on port 5061 resolves most restrictive-network cases, because that traffic looks like ordinary HTTPS to intermediate equipment.

Last updated 17 Sep 2026. Something wrong or missing here? Tell us — we would rather fix the page than answer the same ticket twice.