Up to 9 call appearance lines * Shared Call and Bridged Line Appearances * Local 3-way conference * Intercom with auto-answer * Live dial pad or pre-dial support * Digium"s Asterisk Business Edition - supports Busy Lamp Field (BLF), Intercom * BroadSoft"s BroadWorks enhanced SIP - supports Shared Call Appearances, Busy Lamp Field (BLF), CommPilot Call Manager * Nortel"s MCS 5100/5200 SIP supports Conferencing, Voicemail,and NAT Traversal * Sylantro"s SIP - supports Bridged Line Appearances (BLA), Comcierge, Call Park/Pickup, Conference