BT Quantum: conference calls

BethM — Fri, 31 Jul 2026 15:24:14 GMT

The BT Quantum phone system is no longer supported by BT Business. Support ended on 30 September 2025, and we won't update this page if anything changes with the product.

If you're looking for a replacement system, check out all our cloud-based phone systems.

The conference facility on your BT Quantum lets you hold a three-way conversation between:

Three extensions, or
Two extensions and an exchange line, or
Two exchange lines and an extension.

Setting up a conference call

If you're on an internal or external call and want to add an external number:

Scroll down and select External conference.
Select a free line and dial the external number.
When the call is answered, select Conference on the display.

If you're on an external call and want to add an internal number:

Scroll down and select Internal conference.
Select the extension.
When the call is answered, select Conference on the display.

From a standard telephone:

Press the R button while on a call.
Make the second call.
When it’s answered, dial R3 for all parties to join the conference.

You can find full details in the BT Quantum User Guide.

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BT Quantum: conference calls

Setting up a conference call