I just submitted ticket CWT-799392 but hopefully someone can help me with this.

"Yesterday and today I have had this happen 3 times total. I will pick up a call, and no one is there. Once I hang up, all our phones ring and ring and ring until I unplug the power to the grandstream. Please help."

I have a grandstream in front of my linksys router. Grandstream is plugged into the router, and router is plugged into grandstream.