I have an Audix Intuity 5.1-15 Rel 5 that every so often will give a recording "All circuits busy, returned to previous activity. For help, press *H". There are several "tenants" in the voice mail and it happens on them all. It happens after an auto attendant answers and then you dial an extension or press a digit (to dial an extension). Would busy ports cause this? There are 12 ports. I tested each port and they all take calls ok. Is there a report or something that will tell me if all ports are ever busy?