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Voice over Internet Protocol (VoIP) delivers calls over the internet direct to your PC or smartphone. To make use of this feature, you will need good quality broadband and your PC will need speakers and a microphone


You can have the equivalent of an extra phone line direct to your PC, without having to buy an additional phone line from BT.

When used on a smartphone you can use wifi rather than your mobile call or data allowance.

Cheaper to run than an additional fixed phone line.

Fully integrates into the Flextel service, so it shows both DND and CLI on a VoIP softphone.
You will need software on your computer that can interpret VoIP. There are hundreds of software packages available of varying qualities, but we've found the products made by Zoiper to be very good.

To receive calls on your Flextel number over VoIP, you need to route your Flextel number, in your Dashboard to Flextel VoIP.

Click on the adjacent VoIP settings section to get the information below to enter into your downloaded SIP softphone.

    Your Username (user id) will be your Flextel number
    Your Authentication User will be your Flextel number
    Your Caller ID will be your Flextel number
    The domain (host) required is sip.flextel.net

We will provide you with a strong password of random characters, which you can be reset.
Presentation CLI or Caller ID must be one of your Flextel numbers; do not break the number up with spaces.

Additional settings

Depending on your router and firewall you may also need to:
    Use a STUN server, zoiper provide one by default
    Set your softphone to use Audio Codec settings to G711 (aLaw)
    Set your softphone network settings, transport type to use UDP packets only
    If you have a restrictive firewall, allow traffic from and to IP address and

If you want to use your VoIP destination as an option for Auto_Attendant then see the VoIP section of Setup for Advanced Users