# SIP trunking

> Order SIP trunk channels and trunk licences, choose a call plan for each trunk, and cancel them.

- URL: https://kb.voipcloud.online/au/services/sip-trunking/
- Section: Services
- Type: reference
- Applies to: All countries
- Portal page: /order_services/sip_trunks
- Last reviewed: 2026-11-09

**Services** › **SIP trunking** is where you order what you need to connect another phone system to your PBX: your own on-premises or hosted PBX, another provider, a voice AI platform or Microsoft Teams. You then add a [SIP trunk](https://kb.voipcloud.online/au/pbx/accept-make-divert/sip-trunk/) object to your call flow on the **PBX** tab.

You order two things here:

| Item | What it's for |
| --- | --- |
| **Channels** | How many calls can be connected at the same time, inbound and outbound, across all your SIP trunks. One channel carries one call. |
| **Trunk licences** | One per SIP trunk object in your call flow. Each licence has its own call plan and subaccount. |

For example, you can order 6 channels and give 3 to one SIP trunk object and 3 to another. You set how many each trunk uses with **Number of channels** in the SIP trunk object.

**On a free trial?** Free trial accounts can have up to 5 SIP trunk channels, and only one call plan is available for trunk licences. To order more trunk licences, verify your identity first. See [Your free trial](https://kb.voipcloud.online/au/getting-started/free-trial/).

## Channels

Click **+** or **−** next to **Channels** to change how many you have. The change goes into the **Order summary** on the right.

You can't reduce channels below the number your SIP trunk objects use. If you try, the portal asks you to decrease their usage in the PBX first: lower **Number of channels** in your SIP trunk objects and click **Apply configuration**, then order fewer channels.

## Trunk licences

The **Trunk licences** table lists every licence you have.

| Column or setting | What it does |
| --- | --- |
| **Search by name or subaccount** | Finds a licence. |
| **Call plan** (filter) | Shows only licences on one call plan. |
| **Show only non-assigned licences** | Shows licences that no SIP trunk object uses yet. |
| **PBX object name** | The SIP trunk object that uses this licence, or **Not assigned licence**. |
| **Call plan** | The call plan for outgoing calls through this trunk. You need one if you plan to make outbound calls through the SIP trunk. You can change it at any time. |
| **Subaccount** | The licence's subaccount. You can use subaccounts to filter reports. |
| **Unsubscribe** | Cancels the licence. |
| **Add licence** | Adds a new trunk licence. |

To compare call plan rates, use [Check call rates](https://kb.voipcloud.online/au/billing/check-call-rates/).

## Order channels and a trunk licence

1. Go to **Services** › **SIP trunking**.
2. Set the number of **Channels** with **+**.
3. Click **Add licence** and choose a **Call plan** for the new licence.
4. Check the cost in the **Order summary** on the right.
5. Tick **Agree to service terms and conditions** and click **Submit order**.

See [Order summary](https://kb.voipcloud.online/au/services/order-summary/) for how charges are shown and what to do if your balance is too low.

Then add the trunk to your call flow: drag a **SIP trunk** object onto the canvas, choose the call plan of the new licence in **SIP trunk call plan** (the list shows trunk call plans that still have a free licence), set the **Number of channels** and click **Apply configuration**. See [SIP trunk](https://kb.voipcloud.online/au/pbx/accept-make-divert/sip-trunk/).

## Change a trunk's call plan

1. Find the licence in **Trunk licences**.
2. Choose a different **Call plan**.
3. Tick **Agree to service terms and conditions** and click **Submit order**.

Archived call plans can't be chosen for a new licence. A licence already on an archived plan keeps it until you change it.

## Cancel a trunk licence

You can't cancel a licence while a SIP trunk object uses it.

1. On the **PBX** tab, delete the SIP trunk object or switch it to another licence, and click **Apply configuration**.
2. Go to **Services** › **SIP trunking** and click **Unsubscribe** next to the licence.
3. Tick **Agree to service terms and conditions** and click **Submit order**.

Changed your mind before submitting? Click **Cancel** next to the licence to keep it. For a licence you added but haven't ordered yet, click **Cancel order**.

## Set up the other side

Step-by-step guides for connecting other systems:

- [3CX](https://kb.voipcloud.online/au/teams-and-sip/sip-trunking/3cx/)
- [FusionPBX](https://kb.voipcloud.online/au/teams-and-sip/sip-trunking/fusionpbx/)
- [FRITZ!Box](https://kb.voipcloud.online/au/teams-and-sip/sip-trunking/fritzbox/)
- [Retell AI](https://kb.voipcloud.online/au/teams-and-sip/sip-trunking/retell-ai/)
- [Microsoft Teams Direct Routing](https://kb.voipcloud.online/au/teams-and-sip/microsoft-teams/direct-routing-overview/)

## Related

- [SIP trunk](https://kb.voipcloud.online/au/pbx/accept-make-divert/sip-trunk/)
- [Order summary](https://kb.voipcloud.online/au/services/order-summary/)
- [PBX licences](https://kb.voipcloud.online/au/services/pbx-licences/)