Mitel 5310 IP Conference Saucer - Dark Grey Part# 50004459 NEW You Need to Buy a 5310 IP Conference Module in order to connect the Mitel 5310 Conference Saucer to your Phone. if connecting to a 5300 phone use: 50005321 5310 IP Conference Module if connecting to a 5200 phone use: 50004461 5310 IP Conference Module