We have ext. 9145 and It delayed more than 10 seconds when we dialed internally from and internal phone. It is connected normally when it dialed from external number.
We had few 9xxx DID. But this is the only one that having issue since this is the only one that has 91XX. Other exts are 93XX, 95XX, 97XX.
I am thinking that it has a conflict with 911 route pattern but seems to just have happening recently.
I also created a test ext. 9140 and i got the same delay.