We use cisco pgw for only ss7 signalling. All of the E1 connection's ISUP protocol is q767_base. Can we carry OCN (Orginal called messages) messages? We don't have pgw'call control unit.
I do not think you will be able to do this. You are using Q.767 and it is an international variant only.
Have a look at table A-66 for ocnInclude. This is only supported in ANSI.
Hope this helps answer your question