1)A single module with 2 E1; 2)Support SIP, H323, SS7, PRI; 3)Locates on the ... and IP network, providing between SS7(ISDN PRI, CAS, V5.2 ) and SIP protocol transform. as well as media transfers between ... ) -ISDN-PRI(ITU-T Q.931,Q.921) -V5.2(ITU-T G.964, G.965)·VoIP protocol support: -SIP ... Application as follow shows:Figure 1 ITSP to PSTN Figure 2 VoIP net work for branches Figure 3 Media gateway of ...