Docs › Wholesale & Carriers › Inbound Numbers, IVR & Callback Routing
Wholesale & Carriers 3 min read Updated 25 Jul 2026

Inbound Numbers, IVR & Callback Routing

Configure inbound voice routing (forward, IVR, callback) and inbound SMS on your assigned numbers.

Inbound Numbers, IVR & Callback Routing

Beyond outbound termination, your wholesale account can also receive real inbound traffic — voice and SMS — on numbers assigned to you by 6X. This covers how to configure a number once it's assigned, build a basic IVR menu, and use callback routing.

Getting a Number

Numbers are assigned by 6X support — contact us to get one added to your account. Once assigned, it appears under Inbound Numbers in the sidebar with independent Inbound and Outbound toggles, so a number can be inbound-only, outbound-only, or both.

Routing Types

Open Inbound Numbers → Configure on any assigned number to choose how it handles incoming calls:

  • Forward — bridges the call straight to a number or SIP URI you specify (e.g. your own softswitch or SIP endpoint).
  • Basic IVR — plays a greeting and routes the caller by key press. Build menus under Basic IVR in the sidebar.
  • Callback — answers, asks the caller to enter a number, then calls them back on that number — routed through your account's normal outbound rates/balance, same as any call you place yourself.
  • None — the number doesn't accept inbound calls even if the Inbound toggle is on.

Building a Basic IVR Menu

  1. Go to Basic IVR in the sidebar and click Create IVR Menu.
  2. Name the menu and optionally upload a greeting WAV — drag and drop or click to browse, auto-converted to the right format. Leave it blank for a default tone.
  3. Add key options: for each digit, choose Forward (bridge to a number/SIP URI), Callback, Operator (same as Forward, for a "press 0" style option), or Hangup.
  4. Set the input timeout and max invalid attempts, then save.
  5. Assign the menu to a number under Inbound Numbers → Configure, routing type Basic IVR.

Inbound SMS

If your assigned number is SMS-enabled, inbound text messages to it are logged automatically — check SMS CDRs, where inbound messages show a purple ⬇ IN badge and a Received status, separate from your outbound sends.

Billing

💡 Inbound is free. Inbound voice minutes and inbound SMS are not billed — only the number's monthly rental (invoiced separately by support) applies. Callback calls are the one exception: the outbound leg back to the caller is billed at your normal rate, since it's a real call your account is placing.

Notes

  • DTMF is RFC2833 by default across the platform — there's no per-account setting for this yet.
  • Number assignment itself is support-only; routing configuration (forward destination, IVR menu, callback, in/outbound toggles) is fully self-service.
← Previous
Testing Your Routes
Was this article helpful?