SmatterChew

via: http://www.google.com/support/forum/p/voice/thread?tid=2fb1e7b59bd97d92&hl=en&fid=2fb1e7b59bd97d920004907799acee5

If you’re a Google Apps domain admin, you can turn on Contacts service for a Google Apps domain by following the steps below:
1. Sign in to your Google Apps control panel at http://www.google.com/a/[yourdomainname]
2. Click the ‘Add more services’ link next to ‘Service settings.’
3. Under the ‘Google services’ section, find Contacts and click the ‘Add it now’ button.