I'm facing problem with my Call Manager 8.6(2)SU3.
I have 2 cluster Call Managers. Call Manager 6.1 and Call Manager 8.6. and I want to migrate all of users and phones in Call Manager 6.1 to 8.6, for reason handset can rollback when migration fail i turn off security by default by set true "Pre Cluster 8.0 rollback" in enterprise parameter. and i'm facing little bit of problem in this migration.
some 7940/60 on cluster 6.1 would not migrated to 8.6 cluster because of configuring IP( i've checked the DHCP and network, both of them are OK). then i upgraded the ip phone firmware to the latest version (form 8.1.2 to 8.1.2SR2) and the problem is solved, registered well on 8.6 cluster.
after 2 weeks (some people have migrated to 8.6 cluster), now i'm facing the same issue/problem. because on network issue to Call Manager, unfortunately some ip phone that experiencing the issue before, would not registered and configuring ip again like before, and then solved by downgrade the ip phone firmware (from 8.1.2SR2 to 8.1.2).
my question is, what is the root cause of this problem? i'm afraid that the problem come again oneday. whether turn off security by default can cause this problem?
i have gathered two log files from wireshark :
1. the log when IP Phone configuring IP and i got error message :
source(TFTP) dest(IP Phone) === Data Packet , Block: 13 (last)
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the softkeys. You enable or disable them via TCL. Here is the long
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