One CCM Cluster (v4.1(3))with two callManagers are located in the head office, all the ip phones in head office are fine. However in the remote site, all the ip phones can be registered to one of the two CallManagers only depending on option 150 pointing to which TFTP server(Publisher CallManager or Subscriber CallManager) is configured on the DHCP server which is on the publisher CallManager. But all the ip phone services are not displayed (e.g: extension mobility) when you click the service button on ip phone. Also, all the IP Phone service URL information is not existed in those IP Phones.
This is very strange, is there anyone experienced the same problem?
The reason for IP Phones connecting to the Option 150 is that they cannot contact the CCM configured in the CCM group in the configuration file so if I remember correctly they attempt to register with its TFTP as last option. If instead of using DHCP you set the IP info statically what happens?
You may check TFTP detailed traces or sniffer traces to find out what happening.
Make sure you have configure IPs instead of name under CCMAdmin|System|Server.
You are right. We did the TFTP trace, found the remote site IP Phone can not download the configuration information via TFTP. The third company who is managing the WAN blocked the TFTP traffic over the WAN.
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