The Siemens Optiset E Microphone (Part Number L30460-X1279-X2) is available from Office Phone Shop fully tested 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