I am almost sure you are facing a DNS problem here.
The EM application URL's use backreferences to the CCM server, and even if you configured the services to use IP addresses, the EM will use what it sees in the CallManager server configuration (hostname, FQDN).
If I were you I would try to sniff the TCP traffic on the phone and see what it is trying to use to connect to using HTTP.
Thanks for your response, but I dn't think it's a DNS problem. Nevertheless, if I was to sniff the TCP traffic on the phone and see what its trying to use to connect to using HTTP, how do I go about the process of acheiving this. I'll appreciate your response. Thank you.
actually, are you able to open the EM URL in a browser (the same way as it is configured on the CallManager)?
If you want to set up sniffing, you may want to set up a monitor session on the switch where the phone is connected to and span the traffic to a dedicated switch port where you could intercept it. Watch for the traffic between the phone's IP address and the server's one.
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