[Freeswitch-users] Transparency in SUBSCRIBE and NOTIFY

Hi, My SIP User-Agents need to establish between themselves a mesh of SIP subscriptions (using SUBSCRIBE and NOTIFY). The event-packages of those subscriptions are two, their names are: "dialog" and "p-np-session". But FreeSWITCH replies 489 Bad Event to SUBSCRIBEs to "p-np-session" and 200 OK to SUBSCRIBEs to "dialog" (because FreeSWITCH implements this package but that's not what I need) So, is there some way to make FreeSWITCH transparent to those subscriptions (like a vanilla SIP proxy would be) ? Any suggestions ? Many Thanks.