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Jan, Thank for clear answer. I don't really need registration. I was trying to understand underlying mechanism. In fact I was also trying to understand how to Enterprise voice Integration with "PBX integration" checkbox is working and eventually found out that it wont integrate neither to pbxnsip nor to any other pbx that is not supporting their xml based call controlling api. In your wiki page I see this checkbox also not set. Regards

I know that Mediation Server is acting like transcoding gateway. What I am trying to understand is whether right now OCS is registering its extension on pbxnsip(through Mediation) or pbxnsip is registering on OCS(through Mediation Server). Who's registrar in this case?

Does it mean pbxnsip is able to register on OCS through Mediation Server, or does it mean OCS is registering its extension on pbxnsip through Mediation Server? In which mode this registration can happen, in Enterprise Voice or Enterprise Voice with PBX integration?

Thanks for prompt reply. I've read this wiki, however, does it mean pbxnsip is registering(SIP REGISTER) on OCS in Enterprise Voice mode? I don't see anything about PBX integration mode...

Hi guys, I'm looking for any information regarding PBX integration mode of OCS2007. Seems not much out there... However, as far as I understand in this mode IP-PBX extension is basically replicating OCS extension. Does it mean OCS (not OC) should register its extension on IP-PBX, perhaps through Mediation? I wasn't able to make OCS to send a single register message out. Cheers.