Provider Setup
Configure SipLine with Free (Freebox)
Use your Free VoIP line with SipLine to make and receive calls from your computer. This guide walks you through enabling SIP access and configuring SipLine with your Freebox credentials.
7 min read
Prerequisites
- A Freebox with an active VoIP line (landline number starting with 09)
- SipLine installed on your computer
- Access to your Free account at https://subscribe.free.fr
Table of Contents
1
Enable SIP Access on Your Free Account
Log in to your Free account at subscribe.free.fr. Navigate to Téléphonie > Gestion de mon compte SIP. If SIP is not yet enabled, activate it from this page. Free will generate a SIP password for you.
Enabling SIP access on your Free account means your Freebox handset and SipLine will share the same line. Only one device can be registered at a time unless you use a specific configuration.
2
Note Your SIP Credentials
On the SIP management page, you will see your SIP username, which is your Free landline number in
09XXXXXXXX format. Your SIP password is displayed or can be regenerated on the same page. Write these down — you will need them in the next step.If you do not see the SIP management section, make sure your Freebox plan includes a VoIP line. Some older or budget plans may not have this feature.
3
Configure the Account in SipLine
Open SipLine and go to Settings > SIP Accounts > Add Account. Enter the following: SIP Server:
freephonie.net, Port: 5060, Transport: UDP, Username: 09XXXXXXXX (your Free landline number), Password: the password from the Free SIP management page.The server is
freephonie.net, not free.fr or freebox.fr. This is the dedicated SIP registration server for Free VoIP. Note that SipLine uses local port 15060 by default to avoid conflicts with other SIP software.4
Select the G.711a Codec
In SipLine's account settings, go to the Codecs tab. Enable
G.711a (PCMA) and set it as the preferred codec. Free's VoIP infrastructure works best with G.711a. You can keep G.711u (PCMU) as a secondary option.Avoid using low-bitrate codecs like G.729 with Free — they are not officially supported and may cause audio quality issues.
5
Test Your Connection
Save the account settings and wait for the status to show Registered. Make a test call to a mobile or landline number to confirm audio works in both directions. You can also call your own Free number from another phone to test incoming calls.
If registration fails with a 401 Unauthorized error, regenerate your SIP password on the Free account page and try again.
Frequently Asked Questions
Where do I find my Free SIP password?
Log in to subscribe.free.fr, go to Téléphonie > Gestion de mon compte SIP. Your SIP password is shown there. If it is not visible, click the button to regenerate a new one. Note that regenerating the password will disconnect any currently registered SIP device.
Does SipLine work with Free from outside my home network?
Yes. Unlike the Freebox handset, SipLine connects to
freephonie.net over the internet, so it works from any network — at home, at the office, or on a mobile hotspot. Just make sure outbound UDP traffic on port 5060 is not blocked by your network.What are the limitations of Free SIP?
Free SIP allows only one simultaneous registration. If SipLine is registered, your Freebox handset will not receive calls, and vice versa. Also, Free SIP does not support TLS or SRTP encryption. Emergency calls (112, 15, 17, 18) must be made from the Freebox handset or a mobile phone, not from SipLine.
Which audio codecs are compatible with Free?
Free supports
G.711a (PCMA) and G.711u (PCMU). PCMA is recommended as the primary codec since it is the default for European telephony. Other codecs such as Opus or G.729 are not supported by Free's infrastructure.My calls connect but I have no audio — what should I do?
This is usually a NAT or firewall issue. Make sure your router or firewall allows UDP traffic on ports
5060 (SIP signaling) and the RTP range (10000–20000). In SipLine, try enabling STUN (e.g., stun.freephonie.net) in your account's network settings to help with NAT traversal.Related Guides
Ready to Get Started?
Download SipLine for free and follow along with this guide.