The customer have an AR2831 router and a E1Vi interface, but they don't know what the steps are to make the basic configurations to connect the router with a PBX.
According to the attachment topology the steps are:
-Enable PRI mode on controller E1 (interface serial 1/0:15 its created)
-Configure ISDN parameters on serial 1/0:15 interface.
-Configure the pots interface and associate the line 1/0:15
-configure the VoIP parameter.
for detail information and command refer to document SE0000169728 voice part.