The SPA112 is a 2 port Analog Telephone Adaptor (ATA). This box will convert the analog signals from a regular phone line into a VoIP phone system. If used for telephones, this works best for those who only want to switch to VoIP for its amazing cost saving abilities and who do not need all of the great call features (call features are hardware specific).
BitBlock recommends the SPA112 to anyone who needs to connect analog phones, postage machines, or fax machines to a VoIP service. BitBlock can make your fax service much smarter and easy to analyze (no more lost faxes etc.) by upgrading to Fax-To-Email service - please consider that option first.
An ATA like the SPA112 can be combined with Fax-To-Email service. The SPA112 would be used for sending from plain paper while the gateway service could be used for sending electronic documents and all receiving.