I have setup PBXnSIP successfully with a trunk to OCS so that I can make outbound calls OK.
I don't have any SIP clients directly connected to the PBX, they are all behind OCS as PC clients.
I want to direct inbound calls from the ITSP trunk to a number in OCS, for example +442031239172, 172 being the extension. I understand that the dial plan is only used for outbound calls, so I can't use that.
I don't have PBXnSIP 'Accounts' setup for each user in OCS, there doesn't seem to be any benefit in this duplication if they never register with the PBX and are always behind OCS.
How do I do this redirect? I know the easy answer might be to 'create an account', but when I start having DID numbers I don't want to have to create an account for every user just to redirect the call.