The Cisco ATA 186 modem features two voice ports that connect legacy telephones to IP-based networks. Integrated with a Web server, configuring this Cisco VIC Modem is a snap. For enhanced protection and security purposes, this Cisco analog telephone adaptor displays passwords as asterisks instead of clearly readable text. For a clear natural sounding voice, the Cisco ATA 186 modem uses advance preprocessing for optimization of full-duplex voice compression. The line-echo cancellation feature in this Cisco VIC Modem eliminates noise and echo. The Cisco analog telephone adaptor features Voice activity detection (VAD) and comfort noise generation (CNG) that help save precious bandwidth by delivery voice instead of silence. Use the Cisco ATA 186 modem in any environment, thanks to its Small form-factor design.