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| 1. | 
Model # DKSUB424 | | 1 per system. Requires either RCTUA, RCTUBA/BB, RCTUC/D, or RCTUE/F. Read More
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Click here to contact Sales for pricing! |  Detail Box |  Info Center
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| 2. | 
Model # DKSUE424 | | Maximum 1 per RCTUB system.1 to 5 per RCTUC/D system.1 to 6 per RCTUE/F system. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 3. | 
Model # RCTUA | | 1 common control unit per system. Does not support Expansion Cabinets or advanced features of T1, Attendant Consoles, SMDI, or ACD/MIS. (Release 1, 2, 3 or 4) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 4. | 
Model # RCTUBA | | 1 per system. Supports Base Cabinet, 1 Expansion Cabinet, and advanced DK424 features. Requires RCTUBB. (Release 4) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 5. | 
Model # RCTUBB | | 1 per RCTUBA required. (Release 4) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 6. |
Model # RCTUC | | 1 per system. Supports Base Cabinet and 1 to 5 Expansion Cabinets and advanced features. Requires RCTUD. (Release 4) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 7. |
Model # RCTUE | | 1 per system. Supports base cabinet, 1 to 6 expansion cabinets, and advanced DK424 features. Requires RCTUF. (Release 4) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 8. |
Model # RCTUC3 | | 1 per system. Supports Base Cabinet and 1 to 5 Expansion Cabinets and advanced features. Requires RCTUD. (Release 4.1) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 9. |
Model # RURA | | Use 1 kit to upgrade RCTUA3A to Release 4.0 software. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 10. |
Model # RURB | | Use 1 kit to upgrade RCTUBA/BB3 to Release 4.0 software. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 11. |
Model # RURD | | Use 1 kit to upgrade RCTUC3/D3 to Release 4.0 software. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 12. |
Model # RBDB2 | | 1 per system required when 3 to 7 cabinets are connected to reserve batteries. Includes 6 Power Supply to RBDB2 cables (5-ft.). Read More
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Click here to contact Sales for pricing! | Detail Box
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| 13. |
Model # RBTC2-1-5M | | As desired (see RBDB for DK280 or RBDB2 for DK424) Read More
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Click here to contact Sales for pricing! | Detail Box
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| 14. | 
Model # RMDS | | 1 per system to provide a 1200/2400 BPS modem. Mounts piggy-back onto the RSIU. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 15. |
Model # RPSU280 | | Replacement power supply for DK280 and DK424 base cabinets and expansion cabinets. Same as RPSU424. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 16. |
Model # RRCS-12 | | 1 per RCTU for connection of DTMF standard telephones, Direct Inward System Access lines, DTMF DID lines, tie lines, Voice Mail devices, or built-in Auto Attendant. Mounts on RCTU unit. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 17. | 
Model # RSIS | | 1 per additional RS-232 port. Maximum of 3 can piggy-back onto the RSIU. Read More
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Click here to contact Sales for pricing! | Detail Box
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| 18. | 
Model # RSIU | | 1 per system to provide from 1 to 4 RS-232 serial ports for SMDI, MIS, SMDR call accounting PC, 280Admin/280Backup PC or maintenance terminal, external modem, or CTI PC. RSIU comes standard with 1 RS-23...Read More
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Click here to contact Sales for pricing! | Detail Box
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