Actually referred to as Headset Assemblies.
Canadian types:
British: Wireless set No 19 Headset Mike Hand No 13 ZA17606 GI
There are more British types, but I'm not familiar with them.
The Tannoy version was to be used by the Driver/Assistant as they thought the signal would be lost in the slip rings of turreted tanks. This proved unfounded and was later dropped. The Tannoy also required a special JD for power if I'm not mistaken.
Geoff