The interface cards provide cost-effective basic telephone service connectivity to allow remote router management, asynchronous dial-on-demand routing (DDR) and dial backup, dial- and fax-out modem access, and low-density remote-access-server (RAS) services. Combined with the differentiated services delivered through Cisco IOS Software, the Cisco routers offer customers best-of-breed scalability, flexibility, and investment protection-all in cost-effective, multifunctional platforms.