Connecting a FreePBX box to 3cx

I have 2 offices that need to be connected. The first, and largest office, already has a 3cx Pro Edition setup and working. The second, smaller office, I want to put a FreePBX in and create a connection to the 3cx PBX in the main office. Will FreePBX show remote presence information (busy, available, etc)? Using a SIP Trunk connection can the extensions from both offices co-exist? I know you can connect 2 FreePBX in this manner.

No it wont know of any status of another proprietary system.