SP-R50P
1 Lines (support 1 SIP account), Support call waiting, call forwarding, call transfer, Call on hold, mute, redial. More

SP-R52P
2 Lines (support 2 SIP accounts), Support call waiting, call forwarding, call transfer, Call on hold, mute, redial. More

SP-R53P
Support 3 lines, three-way conference call, call transfer, call forward, call waiting, call hold, mute, interference free, auto answer, redial. More

SP-R59P
Support 6 lines, three-way conference call, call transfer, call forward, call waiting, call hold, mute, interference free, auto answer, redial, Intercom, speed dial, hot line, IP direct dial. More