RICMP-2501SP: Installation required to enable fax services: 33.6Kbps, 2 Second Transmission Speed, Standard JBIG. Standard 320 Pages Memory. Includes standard Internet Fax (T.37), LAN Fax, IP-Fax (T.38) and Fax Forwarding to Email. Paperless Fax function requires the HDD option Type M1 (007166MIU).