The existed Bandwidth in police system network are more than 2M. It only need to add corresponding IP voice equipments to build a intra IP voice network.

Normally, there are IP phone demand between police center and police station. Meanwhile, satisfy the IP phone access in police station. In city police office, use Aliwei digital gateway connecting PBX through E1 port. PBX connects with PSTN. Select corresponding modules according actual condition

In county police office, use Aliwei analog gateway. Connect FXO port with PBX, Only need to make phone of PBX dial FXO port first, then can realize IP Phone function. All calling of whole system are free.