As the title suggests, the call remains off hook when I call and hang up before the call attendant answers, causing the port to stay off hook and not allow further calls on it. We have the HT818 connected to an Avaya IP Office, and I don’t have access to it. I’ve played with the Loop Disconnect settings and haven’t had any success. Any recommendations I can try? It seems that Grandstream sends a CANCEL signal, but the IP Office keeps the call active all the time.
Thanks in advance for any advice.