Customer has CallManager v5 with 7906 phones. We installed CUCM v11 and I tried to register one phone to upgrade firmware, however it stuck on upgrading. It didn't display that it recieved TFTP information or anything. Then I did a hard reset (boot, hold #, 3491672850*#)
I tried several scenarios for DHCP and TFTP servers. CUCM server as a DHCP and TFTP server, Mikrotik router as DHCP server and my laptop as TFTP, my laptop as DHCP and TFTP. In all the scenarios, the phone is repeatedly sending DHCP requests and doesn't get the IP. My laptop properly recieves the address when I use CUCM and router as a DHCP. When I try to sniff traffic with WireShark I can see phone sending DHCP broadcast requests and then after some time it sends the broadcast DHCP server not found, trying again(or something similar). When I use my Mikrotik router as a DHCP server I can see IP phone requesting the address and router responding with offer, but the phone doesn't wan't to accept it.
Any advice?
PS: I can't see any TFTP requests on my laptop on Tftpd32.
