Same I’m certified as well. One if my major issues with them is secruity. Their ucms are hacked a lot. I had one system that had all the secruity options enabled fail to ban etc. Admin password was 25 characters long, aplha numeric etc. Someone hacked in. Tried to make international calls. But lucky enough I had it blocked on the carrier side.
System was fully updated. Now I only sell hosted. Cost is more but less headaches. Only a handful of clients with grandstream systems now. Just waiting for contracts to end before I switch them to hosted.
Ya there is some stuff that is out of control. I work for a SNL telco company and we tell our customers anywhere from 7-15 business days.
Reason for this is due to amount of staff, and also if a port gets rejected. Losing carrier can be petty and reject for various reasons. Wrong Adress, account number etc.