FOP2 monitor devices (SIP/xxx.xxx.xxx or SIP/somename). It does not know anything about DIDs.
If calls to/from your trunks all have the same device name, then you won't be able to discern them with FOP2, even if they go to different routes based on the DNID (as that logic is set on the dialplan, while the device name is always the same).
So, unless you can configure Asterisk to use different device names for your trunks, you won't be able to monitor them uniquely with FOP2.
Best regards,
