VOIP and DATA – Cisco Aironet Bridge

Can someone help me understand how VOIP and DATA traffic work together.
We have a wireless bridge setup and the VOIP Phones are online but I can’t get internet or network with computers. We have a wireless bridge connection. I ‘ve been testing power injectors and nothing is happening. What can cause the phones to work and not the computers?

The devices being used are Cisco Aironet 1400 http://www.cisco.com/en/US/products/hw/wireless/ps5279/index.html

Please Help