Looking for help here -
I haven't got any experience with Panasonic gear, but am doing some other work at a site tomorrow. They've asked if I can help out with a problem they've having. One extension can dial out DTMF tone, but most cannot. Is this a feature that needs to be enabled on a station by station basis?

Anyone able to offer a suggestion? I've looked through a manual I pulled down from the interwebs, but haven't found it.
Much appreciated, and if you don't feel like you can give that out online, I understand that too.