Bluetooth adapter for office phones

Chinavasion cancelled my order with no explanation, presumably no stock and a refund should come, here’s hoping…

Meantime, my audiologist loaned me an Oticon ConnectLine to try with my Siemens Tek Connect. It works fine, but no effective volume control. My phone is a Vtech mi6877. When the phone rings, I wait until I hear the ringing in my HA’s, then press once the green button on the Tek Connect Remote, and start yakking. Visitors are mighty impressed.
dougy