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Vertical SBX 48-Button Expansion Console
The 48-button digital console for the Vertical SBX phone system. Add this expansion console to any Vertical SBX 24-button or 8-button telephone; this will allow you to have more programmable buttons for one-touch dialing to any internal extension, any group, or external telephone number.
Vertical 48-Button Digital Expansion Console
The 48-button digital console for the Vertical SBX. Add this expansion module to any Vertical SBX 8-button digital telephone (4008-00) or any Vertical 24-button telephone (4024-00). Adding the expansion module will allow you to have more programmable buttons available for one-touch dialing and busy lamp appearances for other extensions on the system.