PA168Q 1-port FXS Gateway     PA168Q is a standard reference design. Many manufacturers had made this model with different outlook and inside pcb, here is an typical example. Standard 1-port FXS Gateway reference design web manual: SIP IAX2 H323 MGCP. Telnet manual: SIP IAX2 H323 MGCP. Front Back Interface PCB Large Check for the long AG1170 SLIC module (from MITS Component) on this image, it is the major difference between PA168Q and PA168V Above pictures taken by Ben Najim.