support center

Bring your own carrier (BYOC)

BYOC is a way to keep your existing phone provider for incoming calls. This is a great alternative to porting your numbers into or to use in countries were we currently don't offer phone numbers (such as China or Russia).

Note that BYOC is only applicable to VoIP phone numbers - ask your provider if it's supported.

Advantages of BYOC vs porting your number

With BYOC, it's easy to get set up quickly and to undo the changes later. If your provider supports it, it's a great way to "test the waters" before fully porting the number.

The disadvantage of porting is simply the amount of paperwork and time overhead. It's a process that can take a few days or more, depending on the upstream telephony provider and whether they accept the application or not (sometimes they request extra information to verify the identity of the requestor). It's also harder to port the number out if you ever decide to leave

Note: BYOC does not impact outgoing calls. All outgoing calls are made through the existing telephony network, however the caller id displayed for outgoing calls will be your BYOC'd number from your existing carrier. Only incoming calls are first routed through your existing carrier.

Can I continue using my softphone after setting up BYOC?

Moving forward, you will be able to make outgoing calls with your softphone. However, the incoming calls will always be routed to It's not possible to have both your softphone and your app ring at the same time.


  1. Contact your existing carrier to find out if and how to forward your calls to another carrier via SIP.
  2. Ask your carrier for a list of IP addresses used to forward the calls. We will need them for an IP whitelist to be able to accept incoming calls.
  3. Send an email to and include the the following:
    • Name of existing carrier.
    • Phone number(s) you wish to forward to and their corresponding user account's in to map to.
    • IP addresses from your existing carrier to be added to our whitelist.
    • Once you've received confirmation from the support team, have your carrier set up a forwarding for each of the numbers you wish to use in Based on where your existing carrier is geographically located and handing calls off from, select a location to forward the calls to which is "close" in terms of latency:
  4. Set up a SIP forward rule with your existing carrier of the form: <number>@<hostname from step 4>. An example would be


There are no additional charges or discounts when utilizing BYOC. Note, however, you will be charged by your existing carrier for incoming calls which are forwarded to through BYOC.