Provides 16 VoIP channels – when more than the 8 built-in VoIP channels are required- Allows addition of VoIP channels – in increments of 16, up to the system maximum of 128- VoIP channels are used for IP telephones, IP trunks, and IP networking- Additional VoIP channels require VoIP Channel Licenses see below- Equipped with gigabit port RJ45 8-conductor jack- Installs in dedicated connector on CPU card