Compass Font Files Helper example. http://compass-style.org/reference/compass/css3/font_face/

compass-font-files-example.scss

// 1. Put yout fonts in the compiled folder of your projec. Ex.: www.yoursite.com/css/fonts/
// 2. To enable relative paths to assets via compass helper functions on config.rb uncomment relative_assets = true

// Import the Compass Font Face module
@import "compass/css3/font-face";

// regular
@include font-face('cabin', 
  font-files(
    'Cabin-Regular-webfont.woff', woff,
    'Cabin-Regular-webfont.ttf', ttf,
    'Cabin-Regular-webfont.svg', svg),
    'Cabin-Regular-webfont.eot');

// bold 
@include font-face('cabin', 
  font-files(
    'Cabin-Bold-webfont.woff', woff,
    'Cabin-Bold-webfont.ttf', ttf,
    'Cabin-Bold-webfont.svg', svg),
    'Cabin-Bold-webfont.eot'
    ,bold,normal);

// italic 
@include font-face('cabin', 
  font-files(
    'Cabin-Italic-webfont.woff', woff,
    'Cabin-Italic-webfont.ttf', ttf,
    'Cabin-Italic-webfont.svg', svg),
    'Cabin-Italic-webfont.eot'
    ,normal,italic);

// bold + italic 
@include font-face('cabin', 
  font-files(
    'Cabin-BoldItalic-webfont.woff', woff,
    'Cabin-BoldItalic-webfont.ttf', ttf,
    'Cabin-BoldItalic-webfont.svg', svg),
    'Cabin-BoldItalic-webfont.eot'
    ,bold,italic);