| Model No. | Description | Remarks |
| D4-308K | MAIN SERVICE UNIT, consisting of (Plastic Cabinet + D4MBUA + D4PWUA) | Standard Shipment |
| D4PWUA | POWER ADAPTER | Spare Part |
| D4MBUB | MOTHER BOARD UNIT, consisting of (3 CO Lines + 8 Digital Key Stations Ports) | Spare Part |
| D4TKUB | CO Trunk CARD, consisting of 3 CO Lines | Expansion Card |
| D4DLUB | Key Station Card, consisting of 8 Digital Key Station Ports. | Expansion Card |
| D4HYUB | HYBRID STATION UNIT: consisting of 6 Digital Key Station + 2 SLT Station ports. | Expansion Card |
| D4SLUB | SLT Station Card, consisting of 8 SLT Station Ports. | Expansion Card |
| D4SLCC | SLT Station Card, consisting of 4 SLT Station Ports. | Expansion Card |
| D4SLCD | SLT Station Card, consisting of 1 SLT Station Port. | Expansion Card |
| D4VSCA | VOICE SERVICE CARD, consisting of 2 Voice Channels (60 seconds) | Optional Card |
| D4VSCB | VOICE SERVICE CARD, consisting of 1 Voice Channel (60 seconds) | Optional Card |
| D4VSCC | VOICE SERVICE CARD, consisting of 2 Voice Channels (60 seconds) with Fax call detection function | Optional Card |
| D4MFCA | MULTI FUNCTION CARD, consisting of (1 Sensor + 1 Relay + 1 Door Phone Port) | Optional Card |
| D4MFCB | MULTI FUNCTION CARD, consisting of 1 Door Phone Port | Optional Card |
| D1CIDC | FSK/DTMF CLI INTERFACE | Optional Card |
