Cisco MCS 7800 Series Manual - Page 33

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Also for Cisco MCS 7800 Series: Quick Start Manual (12 pages), Quick Start Manual (2 pages), End User Manual (6 pages), Quick Start Manual (2 pages), Quick Reference (2 pages), Firmware Migration Master Manual (31 pages), Quick Start Manual (2 pages), Manual (4 pages), Get Started (6 pages), Installation Manual (39 pages), Manual (20 pages), Quick Start Manual (2 pages)

Cisco MCS 7800 Series Manual
Tap that entry to produce the green Call button.
Then tap the green Call button, as shown.