Flexible adapter firmware update is mandatory

The Cisco SPA112 is a very flexible VoIP adapter. Gigaset A400 and Brother Fax function smoothly. Adjustments using Google on the fax machine are at Voip often necessary and varies from one provider to another. T.38 should for faxing / reception when are available also activated.

Absolute requirement:
The Firmare from August 2012 should be downloaded and installed from the Cisco website. Simply googling:
Cisco SPA112 2 Port Phone Adapter Firmware
Otherwise transmits the SPA112, the number of the caller is not properly connected to the phone.