Confirm the extensions both physical and or virtual are allowed in class of service
If on site do you see the system access the 2nd trunk when testing? Are you able to make conference calls?
Make sure in 24-09 fields 2-5 are populated with the number.

I don't remember if this was regarding only PRI's or PRI's and POTS.
It was recommended the call forward in 24-09 be set to no answer and the extension or extensions be put into their own timer class and set the no answer timer to 1 second. I don't recall if this was a earlier software issue.

We get old too soon, smart too late