Cisco Linksys PAP2T Phone Adapter with 2 Phone Ports (SIP)

Internet Phone Adapter with 2 Ports for Voice-over-IP
Feature-Rich VoIP Service through your High-Speed Internet Connection
Enables feature-rich telephone service over your broadband Internet connection
Two standard telephone ports for analog phones or use one of the ports for a fax machine, each with an independent phone number
High quality, clear sounding voice service simultaneous with Internet use
Compatible with all common telephone features: Caller ID, Call Waiting, Voicemail, etc.