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Cisco IP PHONE HTTP ERROR [0] - can't login

Hello Everyone,


We installed CIsco ip telephones to CICM. The phone can be able to join to CICM. I can call the inside CM server, and I can record voices. But the agents can't login on the phone. If we go to settings --> login the phone sent udp request to the CICM, but the answer is HTTP ERROR [0].


The dhcp configuration is good, the DNS server konfiguration is good.


What should I do?


Thank you for your help!

Best Regard,


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