We have been informed that the Plantronics M175C headset has now been discontinued and is no longer available to order. Plantronics are not currently offering a direct replacement for the M175C.
We recommend the Eartec 308 with the QD011 bottom lead as a suitable alternative for those wanting a low cost solution for the Cisco range of SPA desk phones and the headset compatible DECT handsets from Gigaset, snom and Yealink.