1)24 VoIP channel or 12 VoIP channel; ... technology and VoIP for NGN,not only provide E1,FXO,FXS interface, but also provide VoIP interface to ... etc.Product specification:* Provide 32 port FXS or FXO,can be hardware configured with plug-in module ... base on customer requirement.* 24 VoIP channel or 12 VoIP channel* 1 or ... , G.729, G.726-16, G.726-24, G.726-24, G.726-32, G.726-40* Fax ...