Enabling Call Waiting on Yealink T26P

[CarpeDiemTim]

Hey Gang!

I've got a really basic problem that I'm sure other people must've come across, so I'd appreciate any helpful any advice you may have to offer.

All I want to do is enable Call Waiting for our receptionist. We're running 3CX, and her phone is a Yealink T26P.

I've checked the box on that extension in the 3CX admin panel for 'I want to be able to accept more than 1 call at the same time - uses Phone Status', so I'm assuming the issue is on the phone itself.

And basically, it just doesn't work, even though I have it enabled on the phone (Web view [firmware: 6.71.0.168] >> Features >> General Information >> Call Waiting: Enabled). If a call comes in while she's on the phone, the second calls goes to voicemail without any sort of beeping, flashing, or ringing on her phone.

Does anyone know why this might be or how I can go about enabling this simple feature?

Any helpful advice would be greatly appreciated!