Huawei Technologies 
has deployed what is described as the world’s first IP-based base station system (IP BSS) commercial network for China Mobile. The installation uses Huawei’s next generation base station controller, the BSC6000.
The IP BSS commercial network uses IP to transmit voice and data services avoiding the cost of TDM transmission, while meeting the requirements of increased data transmissions.
Huawei estimates that by adopting IP transmission, an operator’s transmission costs can be reduced by 40% while relying on exiting E1 transmission resources.
http://www.huawei.com
