H.323 - 1 to 48 ch (Scalable to 96 ch)SIP - 1 to 256 chBRI - 4 to 8 ch (Scalable With TDA/TDE/NCP to 120 - 600 ch)PRI30 - 30 ch (Scalable With TDA/TDE/NCP to 120 - 600 ch)Analog CO - 2 lines (Scalable With TDA/TDE/NCP to 600 lines)
SLT - 2 (Scalable With TDA/TDE/NCP to 1000)Digital Key Phone - NA (Scalable With TDA/TDE/NCP to 1000)IP Key Phone - 1 to 256 (Scalable With TDA/TDE/NCP to 1000)SIP - 1 to 640 (Scalable With TDA/TDE/NCP to 1000)