Cisco SPA500S Expansion Module
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<b>[Product Information]</b><br>
<ul>
<li>32 programmable multicolored LED buttons</li>
<li>Illuminated line status monitoring (green for idle, red for in use, blinking red for ringing, orange for registration error)</li>
<li>Call transfer; Speed dial; DSS</li>
<li>Busy lamp field; One-touch transfer; Call pickup</li>
<li>Dual images for resilient firmware upgrades</li>
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