Asterisk as CO VoIP using ISDN Lines

Hi everyone,
I have a problem with the sync between Asterisk and PBX connected to PRI between each other.
So, I want that asterisk works transparend to that PBX, but for any reason, there are some parameters that are getting early to the PBX
I need to add a delay on q321 protocol.

Can someone help me with that?

Regads

Alex