Phone Server Flooding Phones with SIP NOTIFY packets?

[lgaetz (Lorne Gaetz)]

Strange SIP NOTIFY behavior

Greetings, I’ve been battling an issue that I cannot quite put my thumb on. On my most recent install for a customer, they started complaining of their phones “locking up”. As I have looked into it, i have found that the PBX is sending a ridiculous amount of SIP notify packets to the endpoints, which causes their CPU’s to spike to 100% and become pretty much unresponsive. I have 50MB wireshark dumps rotating on eth0, and when it starts ramping up, it will fill a 50MB capture file about once a m…