Hi all,
We're in the process of migrating our phones from CUCM 6.1.5 to CUCM 9.1.1. One of our key steps is to change Option 150 in our DHCP server and then reset the phones. In our pilot office of 200 phones, 95% of phones reset, found the new server based on the updated Option 150 field, and registered to the new phone system. 5% of phones held onto the old TFTP information and continued to register against the old CUCM.
The only resolution I could find was the force a factory reset of the phone. A factory reset phone would pick up the new information, register to CUCM 9.1.1 and update it's firmware. As this requires somebody to touch 5% of phone in all of our offices, I'm hoping someone has seen this before and can suggest a resolution. Does it have to do with DHCP lease timeouts (i.e., can I be better assured phones will update all of their lease info if I cut the lease timeouts to 15 minutes)?
Any suggestions would be appreciated.
Thanks,
Ryan