I think there cannot be a problem on CRM side, because i've even tested it without CRM, using simple Avaya test tool (AgentView), but during the call, the app is crashing. When we using ISDN with Avaya AgentView, everything is okay. App is working stable and integrating well. This app has the same method of communication with Avaya systems as our CRM, so in my opinion, if the Avaya test tool will not crash (when i will change something to solve the problem), the CRM will also recieve the correct number instead of "unknown