... channel; 2)1 or 2 E1; 3)With SIP protocol; 4)Signaling support: SS7, ISDN PRI, R2, Q.SIG, V5.2 ... and Fax pass through etc.Product specification:* Provide 32 port FXS or FXO,can be hardware configured with plug-in module base on ... .726-24, G.726-24, G.726-32, G.726-40* Fax support T.38 and pass through* DSP, can handle ... 2 New Subscriber of PSTNFigure 3 New Subscriber of NGNFigure 4 Call Center PBX