The Siemens Active Loudspeaker Box (Part Number L30460-X1278-X) is available from Office Phone Shop, fully tested and remanufactured and with a warranty.
Office Phone Shop can supply a wide range of Siemens phones, accessories and parts.
Office Phone Shop stock a complete range of Siemens Optiset E phone accessories including:
Optiset E Analog Adaptor & PSU
Optiset E Headset Plus Adaptor