In Skype 5.5 (English/Windows), your must enable the Keyboard shorcuts first.
1. Tools -> Options ->Advanced -> Hotkeys.
2. Place a check mark for Enable Hotkeys
3. Place a check mark for the three default Hotkeys listed.
4. Press Save.
Answer Call with Video
Important: THESE ARE NOT STANDARD HOTKEYS. You have to set them up yourself and this is a suggested layout. Per default there are only 3 default shortcuts which are poorly designed. Skype Shortcuts will overwrite Standard Windows Shortcuts, using Ctrl+Shift+Alt across all Skype functions seems to be safe.
Answer call with Video
Focus / Unfocus Skype
Search / Find people on Skype
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