ModemHelp.Org
This site is a free resource site for users,ranging from beginners to advanced users. This site contains links to manufacturer support,driver sites, a discusson list and a massive list of init strings.
http://www.modemhelp.org/
56K modems, Cable modems, DSL modems, and PC modem cards.
USRobotics offers high-performance dial-up modems and business class modems for small- and medium sized business applications like POS (Point of Sale), remote management, and dial-back features. Choose your region.
https://www.usr.com/
Mainpine Limited
Computers, Hardware, Peripherals, Modems - Mainpine Limited. Manufacturer of RockForce multi-port data, voice and fax modems.
http://www.mainpine.com/