---
title: Carriers
description: "The carriers and PBXs listed in the SIP trunk picker, what choosing one fills in for you, and what to do when yours is not on the list."
---

<Badge variant="accent">Voice agents</Badge>

**Add Phone Number**, **Custom SIP Trunk** opens **Connect via SIP trunk**, a
searchable list of 30 carriers, PBXs and contact-centre platforms plus **Custom /
other**. Choosing one pre-fills the trunk's **Nickname** with the carrier's name
and labels the trunk with it in the **Summary**. It fills in nothing else, and
every carrier goes through the same form. In the form's **Trunk & gateways** step,
**Detect** can identify the server at the host you enter and fill in the first
gateway; registration and the SIP options stay for you to enter from the
carrier's own SIP settings. The list is a shortcut, not a different
integration: a carrier that is not listed works through **Custom / other**.

| Carrier | Kind | What the preset fills |
|---|---|---|
| **Custom / other** | Any SIP endpoint | Nothing; start from scratch |
| **Vonage** | Carrier | Nickname `Vonage` |
| **Telnyx** | Carrier | Nickname `Telnyx` |
| **AudioCodes** | Session border controller | Nickname `AudioCodes` |
| **Avaya** | PBX | Nickname `Avaya` |
| **Cisco CUCM / CUBE** | PBX and border element | Nickname `Cisco CUCM / CUBE` |
| **Genesys** | Contact-centre platform | Nickname `Genesys` |
| **Ribbon** | Session border controller | Nickname `Ribbon` |
| **3CX** | PBX | Nickname `3CX` |
| **Maniphone** | Carrier | Nickname `Maniphone` |
| **Bandwidth** | Carrier | Nickname `Bandwidth` |
| **Plivo** | Carrier | Nickname `Plivo` |
| **Sinch** | Carrier | Nickname `Sinch` |
| **RingCentral** | Cloud PBX | Nickname `RingCentral` |
| **8x8** | Cloud PBX | Nickname `8x8` |
| **Zoom Phone** | Cloud PBX | Nickname `Zoom Phone` |
| **Intermedia** | Cloud PBX | Nickname `Intermedia` |
| **Nextiva** | Cloud PBX | Nickname `Nextiva` |
| **Oracle (Acme Packet)** | Session border controller | Nickname `Oracle (Acme Packet)` |
| **Sangoma** | PBX and gateways | Nickname `Sangoma` |
| **Patton** | Gateways | Nickname `Patton` |
| **Mitel** | PBX | Nickname `Mitel` |
| **NEC** | PBX | Nickname `NEC` |
| **Asterisk / FreePBX** | Open-source PBX | Nickname `Asterisk / FreePBX` |
| **Grandstream** | PBX and gateways | Nickname `Grandstream` |
| **Microsoft Teams** | Direct Routing | Nickname `Microsoft Teams` |
| **Five9** | Contact-centre platform | Nickname `Five9` |
| **NICE CXone** | Contact-centre platform | Nickname `NICE CXone` |
| **Talkdesk** | Contact-centre platform | Nickname `Talkdesk` |
| **Amazon Connect** | Contact-centre platform | Nickname `Amazon Connect` |
| **Dialpad** | Cloud PBX | Nickname `Dialpad` |

## What to collect from the carrier

Whichever you pick, the form needs the same 3 things from the carrier's SIP
trunk settings:

1. **Gateway**: the signalling host or IP, port and protocol. Some carriers give
   several; add each as a gateway.
2. **Authentication**: either registration credentials (tick **Requires
   Register**) or IP-based authentication, in which case allow Callab AI's public
   IP on the carrier side; the form prints it under **Register Public IP in
   Contact**.
3. **Number format**: whether the carrier wants the dialled number with or
   without the leading `+`. That sets **Send the leading + to the carrier**.

The field-by-field reference is on [Connect a SIP trunk](/deploy/phone-numbers/sip-trunk#fields).

## Related

- [Connect a SIP trunk](/deploy/phone-numbers/sip-trunk)
- [Phone numbers overview](/deploy/phone-numbers/overview)
- [Transfer Call](/build/tools/transfer-call)