Entry level ip phones with excellent sound quality an enterprise grade feature set and business telephony features the soundpoint ip 331 are two line sip phones that deliver superb sound quality as well as a wide range of supported business telephony features the soundpoint ip 331 phone has a single 10100 ethernet port and is designed for common areas such as lobbies hallways and break rooms as well as various wall mounted deployments the soundpoint ip 331 phone with its dual port 101