how to switchback old SRST phone to new CUCM Cluster ?

[tanan.ead1]

Hi All

       I have SRST phone at remote site and i delete the old CUCM at the old site. now i setup new cucm so how to switch and migrate the old SRST phone to new CUCM, i tried to reset the phone but it still register to gateway as srst mode. i already changed the option 150 on dhcp server to new cucm.

please help

Thanks.

[Georgios Fotiadis]

You may have to delete the ITL files (it is on the phone's security settings) on the phones. Verify that the new TFTP server is present on the phone's settings.