1)8 E1, Media transfer between PSTN and IP network; 2)Conversion from ISDN PRI, SS7, V5.2 to SIP; 3)T ... for ISUP and QSIG Objects) RFC3578(Mapping of ISUP overlap to SIP))-Codec:G.711 U-Law and A-Law, ... have 2 independent VoIP modules;·Each Module contains:-1~4 E1;-128 G.711 Channels;-64 G.723, G.726, ... picture of this model:Diagramm of its application: 1 E1 PRI to SIP Gateway NC-MG900