HaiCan anyone help me, how to upgrade the firmware of IP Phones using TFTP and laptop.Actually my phone is running firmware version 9.1.0 but our CUCM firmware is 9.3.the phones can't get the latest firmware from CUCM. but phones are working fine.So ...

HaiI have a issue with my IP phones, I am from Bahrain, I have a CISCO 2921 Voice Gateway, and Fourtinet 100D firewall installed on our Bahrain Branch Office. And all the IP Phones are registered to Head office CUCM (Version 8.6) In head office also ...