I have 2 OS7200s networked together. All trunk lines are through a PRI at the main site, several EXTs at the secondary site have DIDs from the main sites PRI. Is it possible to use the MOBEX feature from stations on the secondary system when all the trunks are on the main system? I tried to set it up like the others that work, and it wouldn't work.

I remember asking this very question of tech support, I believe the answer is no.

You could try setting up sip petting between the systems and use the sip trunk to dial out.

It was a bit short sited of Samsung to not support mobex in this scenario.